diff --git a/packages/react-dom/src/__tests__/ReactServerRendering-test.js b/packages/react-dom/src/__tests__/ReactServerRendering-test.js
index 0c057c5fade05..23be43a7735a5 100644
--- a/packages/react-dom/src/__tests__/ReactServerRendering-test.js
+++ b/packages/react-dom/src/__tests__/ReactServerRendering-test.js
@@ -14,8 +14,6 @@ let React;
 let ReactDOMServer;
 let PropTypes;
 let ReactCurrentDispatcher;
-const enableSuspenseServerRenderer = require('shared/ReactFeatureFlags')
-  .enableSuspenseServerRenderer;
 
 describe('ReactDOMServer', () => {
   beforeEach(() => {
@@ -678,41 +676,6 @@ describe('ReactDOMServer', () => {
     expect(markup).toBe('<div></div>');
   });
 
-  if (!enableSuspenseServerRenderer) {
-    it('throws for unsupported types on the server', () => {
-      expect(() => {
-        ReactDOMServer.renderToString(<React.Suspense />);
-      }).toThrow('ReactDOMServer does not yet support Suspense.');
-
-      async function fakeImport(result) {
-        return {default: result};
-      }
-
-      expect(() => {
-        const LazyFoo = React.lazy(() =>
-          fakeImport(
-            new Promise(resolve =>
-              resolve(function Foo() {
-                return <div />;
-              }),
-            ),
-          ),
-        );
-        ReactDOMServer.renderToString(<LazyFoo />);
-      }).toThrow('ReactDOMServer does not yet support Suspense.');
-    });
-
-    it('throws when suspending on the server', () => {
-      function AsyncFoo() {
-        throw new Promise(() => {});
-      }
-
-      expect(() => {
-        ReactDOMServer.renderToString(<AsyncFoo />);
-      }).toThrow('ReactDOMServer does not yet support Suspense.');
-    });
-  }
-
   it('does not get confused by throwing null', () => {
     function Bad() {
       // eslint-disable-next-line no-throw-literal
diff --git a/packages/react-dom/src/client/ReactDOMHostConfig.js b/packages/react-dom/src/client/ReactDOMHostConfig.js
index d27bdff4305ab..0cf031776399e 100644
--- a/packages/react-dom/src/client/ReactDOMHostConfig.js
+++ b/packages/react-dom/src/client/ReactDOMHostConfig.js
@@ -63,7 +63,6 @@ import {retryIfBlockedOn} from '../events/ReactDOMEventReplaying';
 
 import {
   enableClientRenderFallbackOnHydrationMismatch,
-  enableSuspenseServerRenderer,
   enableCreateEventHandleAPI,
   enableScopeAPI,
 } from 'shared/ReactFeatureFlags';
@@ -747,19 +746,17 @@ function getNextHydratable(node) {
     if (nodeType === ELEMENT_NODE || nodeType === TEXT_NODE) {
       break;
     }
-    if (enableSuspenseServerRenderer) {
-      if (nodeType === COMMENT_NODE) {
-        const nodeData = (node: any).data;
-        if (
-          nodeData === SUSPENSE_START_DATA ||
-          nodeData === SUSPENSE_FALLBACK_START_DATA ||
-          nodeData === SUSPENSE_PENDING_START_DATA
-        ) {
-          break;
-        }
-        if (nodeData === SUSPENSE_END_DATA) {
-          return null;
-        }
+    if (nodeType === COMMENT_NODE) {
+      const nodeData = (node: any).data;
+      if (
+        nodeData === SUSPENSE_START_DATA ||
+        nodeData === SUSPENSE_FALLBACK_START_DATA ||
+        nodeData === SUSPENSE_PENDING_START_DATA
+      ) {
+        break;
+      }
+      if (nodeData === SUSPENSE_END_DATA) {
+        return null;
       }
     }
   }
diff --git a/packages/react-dom/src/server/ReactPartialRenderer.js b/packages/react-dom/src/server/ReactPartialRenderer.js
index 41c2885680437..03f5355ef0e77 100644
--- a/packages/react-dom/src/server/ReactPartialRenderer.js
+++ b/packages/react-dom/src/server/ReactPartialRenderer.js
@@ -21,7 +21,6 @@ import {
   warnAboutDeprecatedLifecycles,
   disableLegacyContext,
   disableModulePatternComponents,
-  enableSuspenseServerRenderer,
   enableScopeAPI,
 } from 'shared/ReactFeatureFlags';
 import {
@@ -965,21 +964,17 @@ class ReactDOMServerRenderer {
           outBuffer += this.render(child, frame.context, frame.domNamespace);
         } catch (err) {
           if (err != null && typeof err.then === 'function') {
-            if (enableSuspenseServerRenderer) {
-              if (this.suspenseDepth <= 0) {
-                throw new Error(
-                  // TODO: include component name. This is a bit tricky with current factoring.
-                  'A React component suspended while rendering, but no fallback UI was specified.\n' +
-                    '\n' +
-                    'Add a <Suspense fallback=...> component higher in the tree to ' +
-                    'provide a loading indicator or placeholder to display.',
-                );
-              }
-
-              suspended = true;
-            } else {
-              throw new Error('ReactDOMServer does not yet support Suspense.');
+            if (this.suspenseDepth <= 0) {
+              throw new Error(
+                // TODO: include component name. This is a bit tricky with current factoring.
+                'A React component suspended while rendering, but no fallback UI was specified.\n' +
+                  '\n' +
+                  'Add a <Suspense fallback=...> component higher in the tree to ' +
+                  'provide a loading indicator or placeholder to display.',
+              );
             }
+
+            suspended = true;
           } else {
             throw err;
           }
@@ -1097,39 +1092,35 @@ class ReactDOMServerRenderer {
           return '';
         }
         case REACT_SUSPENSE_TYPE: {
-          if (enableSuspenseServerRenderer) {
-            const fallback = ((nextChild: any): ReactElement).props.fallback;
-            const fallbackChildren = toArray(fallback);
-            const nextChildren = toArray(
-              ((nextChild: any): ReactElement).props.children,
-            );
-            const fallbackFrame: Frame = {
-              type: null,
-              domNamespace: parentNamespace,
-              children: fallbackChildren,
-              childIndex: 0,
-              context: context,
-              footer: '<!--/$-->',
-            };
-            const frame: Frame = {
-              fallbackFrame,
-              type: REACT_SUSPENSE_TYPE,
-              domNamespace: parentNamespace,
-              children: nextChildren,
-              childIndex: 0,
-              context: context,
-              footer: '<!--/$-->',
-            };
-            if (__DEV__) {
-              ((frame: any): FrameDev).debugElementStack = [];
-              ((fallbackFrame: any): FrameDev).debugElementStack = [];
-            }
-            this.stack.push(frame);
-            this.suspenseDepth++;
-            return '<!--$-->';
-          } else {
-            throw new Error('ReactDOMServer does not yet support Suspense.');
+          const fallback = ((nextChild: any): ReactElement).props.fallback;
+          const fallbackChildren = toArray(fallback);
+          const nextChildren = toArray(
+            ((nextChild: any): ReactElement).props.children,
+          );
+          const fallbackFrame: Frame = {
+            type: null,
+            domNamespace: parentNamespace,
+            children: fallbackChildren,
+            childIndex: 0,
+            context: context,
+            footer: '<!--/$-->',
+          };
+          const frame: Frame = {
+            fallbackFrame,
+            type: REACT_SUSPENSE_TYPE,
+            domNamespace: parentNamespace,
+            children: nextChildren,
+            childIndex: 0,
+            context: context,
+            footer: '<!--/$-->',
+          };
+          if (__DEV__) {
+            ((frame: any): FrameDev).debugElementStack = [];
+            ((fallbackFrame: any): FrameDev).debugElementStack = [];
           }
+          this.stack.push(frame);
+          this.suspenseDepth++;
+          return '<!--$-->';
         }
         // eslint-disable-next-line-no-fallthrough
         case REACT_SCOPE_TYPE: {
diff --git a/packages/react-reconciler/src/ReactFiberBeginWork.new.js b/packages/react-reconciler/src/ReactFiberBeginWork.new.js
index 88876f05f7d8d..442c95b651250 100644
--- a/packages/react-reconciler/src/ReactFiberBeginWork.new.js
+++ b/packages/react-reconciler/src/ReactFiberBeginWork.new.js
@@ -96,7 +96,6 @@ import {
   disableModulePatternComponents,
   enableProfilerCommitHooks,
   enableProfilerTimer,
-  enableSuspenseServerRenderer,
   warnAboutDefaultPropsOnFunctionComponents,
   enableScopeAPI,
   enableCache,
@@ -2134,17 +2133,15 @@ function updateSuspenseComponent(current, workInProgress, renderLanes) {
     // If we're currently hydrating, try to hydrate this boundary.
     tryToClaimNextHydratableInstance(workInProgress);
     // This could've been a dehydrated suspense component.
-    if (enableSuspenseServerRenderer) {
-      const suspenseState: null | SuspenseState = workInProgress.memoizedState;
-      if (suspenseState !== null) {
-        const dehydrated = suspenseState.dehydrated;
-        if (dehydrated !== null) {
-          return mountDehydratedSuspenseComponent(
-            workInProgress,
-            dehydrated,
-            renderLanes,
-          );
-        }
+    const suspenseState: null | SuspenseState = workInProgress.memoizedState;
+    if (suspenseState !== null) {
+      const dehydrated = suspenseState.dehydrated;
+      if (dehydrated !== null) {
+        return mountDehydratedSuspenseComponent(
+          workInProgress,
+          dehydrated,
+          renderLanes,
+        );
       }
     }
 
@@ -2220,59 +2217,57 @@ function updateSuspenseComponent(current, workInProgress, renderLanes) {
       // The current tree is already showing a fallback
 
       // Special path for hydration
-      if (enableSuspenseServerRenderer) {
-        const dehydrated = prevState.dehydrated;
-        if (dehydrated !== null) {
-          if (!didSuspend) {
-            return updateDehydratedSuspenseComponent(
-              current,
-              workInProgress,
-              dehydrated,
-              prevState,
-              renderLanes,
-            );
-          } else if (workInProgress.flags & ForceClientRender) {
-            // Something errored during hydration. Try again without hydrating.
-            workInProgress.flags &= ~ForceClientRender;
-            return retrySuspenseComponentWithoutHydrating(
-              current,
-              workInProgress,
-              renderLanes,
-              new Error(
-                'There was an error while hydrating this Suspense boundary. ' +
-                  'Switched to client rendering.',
-              ),
-            );
-          } else if (
-            (workInProgress.memoizedState: null | SuspenseState) !== null
-          ) {
-            // Something suspended and we should still be in dehydrated mode.
-            // Leave the existing child in place.
-            workInProgress.child = current.child;
-            // The dehydrated completion pass expects this flag to be there
-            // but the normal suspense pass doesn't.
-            workInProgress.flags |= DidCapture;
-            return null;
-          } else {
-            // Suspended but we should no longer be in dehydrated mode.
-            // Therefore we now have to render the fallback.
-            renderDidSuspendDelayIfPossible();
-            const nextPrimaryChildren = nextProps.children;
-            const nextFallbackChildren = nextProps.fallback;
-            const fallbackChildFragment = mountSuspenseFallbackAfterRetryWithoutHydrating(
-              current,
-              workInProgress,
-              nextPrimaryChildren,
-              nextFallbackChildren,
-              renderLanes,
-            );
-            const primaryChildFragment: Fiber = (workInProgress.child: any);
-            primaryChildFragment.memoizedState = mountSuspenseOffscreenState(
-              renderLanes,
-            );
-            workInProgress.memoizedState = SUSPENDED_MARKER;
-            return fallbackChildFragment;
-          }
+      const dehydrated = prevState.dehydrated;
+      if (dehydrated !== null) {
+        if (!didSuspend) {
+          return updateDehydratedSuspenseComponent(
+            current,
+            workInProgress,
+            dehydrated,
+            prevState,
+            renderLanes,
+          );
+        } else if (workInProgress.flags & ForceClientRender) {
+          // Something errored during hydration. Try again without hydrating.
+          workInProgress.flags &= ~ForceClientRender;
+          return retrySuspenseComponentWithoutHydrating(
+            current,
+            workInProgress,
+            renderLanes,
+            new Error(
+              'There was an error while hydrating this Suspense boundary. ' +
+                'Switched to client rendering.',
+            ),
+          );
+        } else if (
+          (workInProgress.memoizedState: null | SuspenseState) !== null
+        ) {
+          // Something suspended and we should still be in dehydrated mode.
+          // Leave the existing child in place.
+          workInProgress.child = current.child;
+          // The dehydrated completion pass expects this flag to be there
+          // but the normal suspense pass doesn't.
+          workInProgress.flags |= DidCapture;
+          return null;
+        } else {
+          // Suspended but we should no longer be in dehydrated mode.
+          // Therefore we now have to render the fallback.
+          renderDidSuspendDelayIfPossible();
+          const nextPrimaryChildren = nextProps.children;
+          const nextFallbackChildren = nextProps.fallback;
+          const fallbackChildFragment = mountSuspenseFallbackAfterRetryWithoutHydrating(
+            current,
+            workInProgress,
+            nextPrimaryChildren,
+            nextFallbackChildren,
+            renderLanes,
+          );
+          const primaryChildFragment: Fiber = (workInProgress.child: any);
+          primaryChildFragment.memoizedState = mountSuspenseOffscreenState(
+            renderLanes,
+          );
+          workInProgress.memoizedState = SUSPENDED_MARKER;
+          return fallbackChildFragment;
         }
       }
 
@@ -3657,20 +3652,18 @@ function attemptEarlyBailoutIfNoScheduledUpdate(
     case SuspenseComponent: {
       const state: SuspenseState | null = workInProgress.memoizedState;
       if (state !== null) {
-        if (enableSuspenseServerRenderer) {
-          if (state.dehydrated !== null) {
-            pushSuspenseContext(
-              workInProgress,
-              setDefaultShallowSuspenseContext(suspenseStackCursor.current),
-            );
-            // We know that this component will suspend again because if it has
-            // been unsuspended it has committed as a resolved Suspense component.
-            // If it needs to be retried, it should have work scheduled on it.
-            workInProgress.flags |= DidCapture;
-            // We should never render the children of a dehydrated boundary until we
-            // upgrade it. We return null instead of bailoutOnAlreadyFinishedWork.
-            return null;
-          }
+        if (state.dehydrated !== null) {
+          pushSuspenseContext(
+            workInProgress,
+            setDefaultShallowSuspenseContext(suspenseStackCursor.current),
+          );
+          // We know that this component will suspend again because if it has
+          // been unsuspended it has committed as a resolved Suspense component.
+          // If it needs to be retried, it should have work scheduled on it.
+          workInProgress.flags |= DidCapture;
+          // We should never render the children of a dehydrated boundary until we
+          // upgrade it. We return null instead of bailoutOnAlreadyFinishedWork.
+          return null;
         }
 
         // If this boundary is currently timed out, we need to decide
diff --git a/packages/react-reconciler/src/ReactFiberBeginWork.old.js b/packages/react-reconciler/src/ReactFiberBeginWork.old.js
index 418b714117e81..1632501b26db2 100644
--- a/packages/react-reconciler/src/ReactFiberBeginWork.old.js
+++ b/packages/react-reconciler/src/ReactFiberBeginWork.old.js
@@ -96,7 +96,6 @@ import {
   disableModulePatternComponents,
   enableProfilerCommitHooks,
   enableProfilerTimer,
-  enableSuspenseServerRenderer,
   warnAboutDefaultPropsOnFunctionComponents,
   enableScopeAPI,
   enableCache,
@@ -2134,17 +2133,15 @@ function updateSuspenseComponent(current, workInProgress, renderLanes) {
     // If we're currently hydrating, try to hydrate this boundary.
     tryToClaimNextHydratableInstance(workInProgress);
     // This could've been a dehydrated suspense component.
-    if (enableSuspenseServerRenderer) {
-      const suspenseState: null | SuspenseState = workInProgress.memoizedState;
-      if (suspenseState !== null) {
-        const dehydrated = suspenseState.dehydrated;
-        if (dehydrated !== null) {
-          return mountDehydratedSuspenseComponent(
-            workInProgress,
-            dehydrated,
-            renderLanes,
-          );
-        }
+    const suspenseState: null | SuspenseState = workInProgress.memoizedState;
+    if (suspenseState !== null) {
+      const dehydrated = suspenseState.dehydrated;
+      if (dehydrated !== null) {
+        return mountDehydratedSuspenseComponent(
+          workInProgress,
+          dehydrated,
+          renderLanes,
+        );
       }
     }
 
@@ -2220,59 +2217,57 @@ function updateSuspenseComponent(current, workInProgress, renderLanes) {
       // The current tree is already showing a fallback
 
       // Special path for hydration
-      if (enableSuspenseServerRenderer) {
-        const dehydrated = prevState.dehydrated;
-        if (dehydrated !== null) {
-          if (!didSuspend) {
-            return updateDehydratedSuspenseComponent(
-              current,
-              workInProgress,
-              dehydrated,
-              prevState,
-              renderLanes,
-            );
-          } else if (workInProgress.flags & ForceClientRender) {
-            // Something errored during hydration. Try again without hydrating.
-            workInProgress.flags &= ~ForceClientRender;
-            return retrySuspenseComponentWithoutHydrating(
-              current,
-              workInProgress,
-              renderLanes,
-              new Error(
-                'There was an error while hydrating this Suspense boundary. ' +
-                  'Switched to client rendering.',
-              ),
-            );
-          } else if (
-            (workInProgress.memoizedState: null | SuspenseState) !== null
-          ) {
-            // Something suspended and we should still be in dehydrated mode.
-            // Leave the existing child in place.
-            workInProgress.child = current.child;
-            // The dehydrated completion pass expects this flag to be there
-            // but the normal suspense pass doesn't.
-            workInProgress.flags |= DidCapture;
-            return null;
-          } else {
-            // Suspended but we should no longer be in dehydrated mode.
-            // Therefore we now have to render the fallback.
-            renderDidSuspendDelayIfPossible();
-            const nextPrimaryChildren = nextProps.children;
-            const nextFallbackChildren = nextProps.fallback;
-            const fallbackChildFragment = mountSuspenseFallbackAfterRetryWithoutHydrating(
-              current,
-              workInProgress,
-              nextPrimaryChildren,
-              nextFallbackChildren,
-              renderLanes,
-            );
-            const primaryChildFragment: Fiber = (workInProgress.child: any);
-            primaryChildFragment.memoizedState = mountSuspenseOffscreenState(
-              renderLanes,
-            );
-            workInProgress.memoizedState = SUSPENDED_MARKER;
-            return fallbackChildFragment;
-          }
+      const dehydrated = prevState.dehydrated;
+      if (dehydrated !== null) {
+        if (!didSuspend) {
+          return updateDehydratedSuspenseComponent(
+            current,
+            workInProgress,
+            dehydrated,
+            prevState,
+            renderLanes,
+          );
+        } else if (workInProgress.flags & ForceClientRender) {
+          // Something errored during hydration. Try again without hydrating.
+          workInProgress.flags &= ~ForceClientRender;
+          return retrySuspenseComponentWithoutHydrating(
+            current,
+            workInProgress,
+            renderLanes,
+            new Error(
+              'There was an error while hydrating this Suspense boundary. ' +
+                'Switched to client rendering.',
+            ),
+          );
+        } else if (
+          (workInProgress.memoizedState: null | SuspenseState) !== null
+        ) {
+          // Something suspended and we should still be in dehydrated mode.
+          // Leave the existing child in place.
+          workInProgress.child = current.child;
+          // The dehydrated completion pass expects this flag to be there
+          // but the normal suspense pass doesn't.
+          workInProgress.flags |= DidCapture;
+          return null;
+        } else {
+          // Suspended but we should no longer be in dehydrated mode.
+          // Therefore we now have to render the fallback.
+          renderDidSuspendDelayIfPossible();
+          const nextPrimaryChildren = nextProps.children;
+          const nextFallbackChildren = nextProps.fallback;
+          const fallbackChildFragment = mountSuspenseFallbackAfterRetryWithoutHydrating(
+            current,
+            workInProgress,
+            nextPrimaryChildren,
+            nextFallbackChildren,
+            renderLanes,
+          );
+          const primaryChildFragment: Fiber = (workInProgress.child: any);
+          primaryChildFragment.memoizedState = mountSuspenseOffscreenState(
+            renderLanes,
+          );
+          workInProgress.memoizedState = SUSPENDED_MARKER;
+          return fallbackChildFragment;
         }
       }
 
@@ -3657,20 +3652,18 @@ function attemptEarlyBailoutIfNoScheduledUpdate(
     case SuspenseComponent: {
       const state: SuspenseState | null = workInProgress.memoizedState;
       if (state !== null) {
-        if (enableSuspenseServerRenderer) {
-          if (state.dehydrated !== null) {
-            pushSuspenseContext(
-              workInProgress,
-              setDefaultShallowSuspenseContext(suspenseStackCursor.current),
-            );
-            // We know that this component will suspend again because if it has
-            // been unsuspended it has committed as a resolved Suspense component.
-            // If it needs to be retried, it should have work scheduled on it.
-            workInProgress.flags |= DidCapture;
-            // We should never render the children of a dehydrated boundary until we
-            // upgrade it. We return null instead of bailoutOnAlreadyFinishedWork.
-            return null;
-          }
+        if (state.dehydrated !== null) {
+          pushSuspenseContext(
+            workInProgress,
+            setDefaultShallowSuspenseContext(suspenseStackCursor.current),
+          );
+          // We know that this component will suspend again because if it has
+          // been unsuspended it has committed as a resolved Suspense component.
+          // If it needs to be retried, it should have work scheduled on it.
+          workInProgress.flags |= DidCapture;
+          // We should never render the children of a dehydrated boundary until we
+          // upgrade it. We return null instead of bailoutOnAlreadyFinishedWork.
+          return null;
         }
 
         // If this boundary is currently timed out, we need to decide
diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.new.js b/packages/react-reconciler/src/ReactFiberCommitWork.new.js
index 2cb02b2a54664..6712e27bd28e1 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.new.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.new.js
@@ -34,7 +34,6 @@ import {
   enableProfilerCommitHooks,
   enableProfilerNestedUpdatePhase,
   enableSchedulingProfiler,
-  enableSuspenseServerRenderer,
   enableSuspenseCallback,
   enableScopeAPI,
   enableStrictEffects,
@@ -1652,33 +1651,31 @@ function commitDeletionEffectsOnFiber(
       return;
     }
     case DehydratedFragment: {
-      if (enableSuspenseServerRenderer) {
-        if (enableSuspenseCallback) {
-          const hydrationCallbacks = finishedRoot.hydrationCallbacks;
-          if (hydrationCallbacks !== null) {
-            const onDeleted = hydrationCallbacks.onDeleted;
-            if (onDeleted) {
-              onDeleted((deletedFiber.stateNode: SuspenseInstance));
-            }
+      if (enableSuspenseCallback) {
+        const hydrationCallbacks = finishedRoot.hydrationCallbacks;
+        if (hydrationCallbacks !== null) {
+          const onDeleted = hydrationCallbacks.onDeleted;
+          if (onDeleted) {
+            onDeleted((deletedFiber.stateNode: SuspenseInstance));
           }
         }
+      }
 
-        // Dehydrated fragments don't have any children
+      // Dehydrated fragments don't have any children
 
-        // Delete the dehydrated suspense boundary and all of its content.
-        if (supportsMutation) {
-          if (hostParent !== null) {
-            if (hostParentIsContainer) {
-              clearSuspenseBoundaryFromContainer(
-                ((hostParent: any): Container),
-                (deletedFiber.stateNode: SuspenseInstance),
-              );
-            } else {
-              clearSuspenseBoundary(
-                ((hostParent: any): Instance),
-                (deletedFiber.stateNode: SuspenseInstance),
-              );
-            }
+      // Delete the dehydrated suspense boundary and all of its content.
+      if (supportsMutation) {
+        if (hostParent !== null) {
+          if (hostParentIsContainer) {
+            clearSuspenseBoundaryFromContainer(
+              ((hostParent: any): Container),
+              (deletedFiber.stateNode: SuspenseInstance),
+            );
+          } else {
+            clearSuspenseBoundary(
+              ((hostParent: any): Instance),
+              (deletedFiber.stateNode: SuspenseInstance),
+            );
           }
         }
       }
diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.old.js b/packages/react-reconciler/src/ReactFiberCommitWork.old.js
index fbd3873fa54fa..a00355b6f5fc8 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.old.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.old.js
@@ -34,7 +34,6 @@ import {
   enableProfilerCommitHooks,
   enableProfilerNestedUpdatePhase,
   enableSchedulingProfiler,
-  enableSuspenseServerRenderer,
   enableSuspenseCallback,
   enableScopeAPI,
   enableStrictEffects,
@@ -1652,33 +1651,31 @@ function commitDeletionEffectsOnFiber(
       return;
     }
     case DehydratedFragment: {
-      if (enableSuspenseServerRenderer) {
-        if (enableSuspenseCallback) {
-          const hydrationCallbacks = finishedRoot.hydrationCallbacks;
-          if (hydrationCallbacks !== null) {
-            const onDeleted = hydrationCallbacks.onDeleted;
-            if (onDeleted) {
-              onDeleted((deletedFiber.stateNode: SuspenseInstance));
-            }
+      if (enableSuspenseCallback) {
+        const hydrationCallbacks = finishedRoot.hydrationCallbacks;
+        if (hydrationCallbacks !== null) {
+          const onDeleted = hydrationCallbacks.onDeleted;
+          if (onDeleted) {
+            onDeleted((deletedFiber.stateNode: SuspenseInstance));
           }
         }
+      }
 
-        // Dehydrated fragments don't have any children
+      // Dehydrated fragments don't have any children
 
-        // Delete the dehydrated suspense boundary and all of its content.
-        if (supportsMutation) {
-          if (hostParent !== null) {
-            if (hostParentIsContainer) {
-              clearSuspenseBoundaryFromContainer(
-                ((hostParent: any): Container),
-                (deletedFiber.stateNode: SuspenseInstance),
-              );
-            } else {
-              clearSuspenseBoundary(
-                ((hostParent: any): Instance),
-                (deletedFiber.stateNode: SuspenseInstance),
-              );
-            }
+      // Delete the dehydrated suspense boundary and all of its content.
+      if (supportsMutation) {
+        if (hostParent !== null) {
+          if (hostParentIsContainer) {
+            clearSuspenseBoundaryFromContainer(
+              ((hostParent: any): Container),
+              (deletedFiber.stateNode: SuspenseInstance),
+            );
+          } else {
+            clearSuspenseBoundary(
+              ((hostParent: any): Instance),
+              (deletedFiber.stateNode: SuspenseInstance),
+            );
           }
         }
       }
diff --git a/packages/react-reconciler/src/ReactFiberCompleteWork.new.js b/packages/react-reconciler/src/ReactFiberCompleteWork.new.js
index 6beb7eadce375..683d29ab3c880 100644
--- a/packages/react-reconciler/src/ReactFiberCompleteWork.new.js
+++ b/packages/react-reconciler/src/ReactFiberCompleteWork.new.js
@@ -138,7 +138,6 @@ import {
 } from './ReactFiberHydrationContext.new';
 import {
   enableSuspenseCallback,
-  enableSuspenseServerRenderer,
   enableScopeAPI,
   enableProfilerTimer,
   enableCache,
@@ -1066,85 +1065,82 @@ function completeWork(
       popSuspenseContext(workInProgress);
       const nextState: null | SuspenseState = workInProgress.memoizedState;
 
-      if (enableSuspenseServerRenderer) {
-        if (
-          enableClientRenderFallbackOnHydrationMismatch &&
-          hasUnhydratedTailNodes() &&
-          (workInProgress.mode & ConcurrentMode) !== NoMode &&
-          (workInProgress.flags & DidCapture) === NoFlags
-        ) {
-          warnIfUnhydratedTailNodes(workInProgress);
-          resetHydrationState();
-          workInProgress.flags |=
-            ForceClientRender | Incomplete | ShouldCapture;
-          return workInProgress;
-        }
-        if (nextState !== null && nextState.dehydrated !== null) {
-          // We might be inside a hydration state the first time we're picking up this
-          // Suspense boundary, and also after we've reentered it for further hydration.
-          const wasHydrated = popHydrationState(workInProgress);
-          if (current === null) {
-            if (!wasHydrated) {
-              throw new Error(
-                'A dehydrated suspense component was completed without a hydrated node. ' +
-                  'This is probably a bug in React.',
-              );
-            }
-            prepareToHydrateHostSuspenseInstance(workInProgress);
-            bubbleProperties(workInProgress);
-            if (enableProfilerTimer) {
-              if ((workInProgress.mode & ProfileMode) !== NoMode) {
-                const isTimedOutSuspense = nextState !== null;
-                if (isTimedOutSuspense) {
-                  // Don't count time spent in a timed out Suspense subtree as part of the base duration.
-                  const primaryChildFragment = workInProgress.child;
-                  if (primaryChildFragment !== null) {
-                    // $FlowFixMe Flow doesn't support type casting in combination with the -= operator
-                    workInProgress.treeBaseDuration -= ((primaryChildFragment.treeBaseDuration: any): number);
-                  }
+      if (
+        enableClientRenderFallbackOnHydrationMismatch &&
+        hasUnhydratedTailNodes() &&
+        (workInProgress.mode & ConcurrentMode) !== NoMode &&
+        (workInProgress.flags & DidCapture) === NoFlags
+      ) {
+        warnIfUnhydratedTailNodes(workInProgress);
+        resetHydrationState();
+        workInProgress.flags |= ForceClientRender | Incomplete | ShouldCapture;
+        return workInProgress;
+      }
+      if (nextState !== null && nextState.dehydrated !== null) {
+        // We might be inside a hydration state the first time we're picking up this
+        // Suspense boundary, and also after we've reentered it for further hydration.
+        const wasHydrated = popHydrationState(workInProgress);
+        if (current === null) {
+          if (!wasHydrated) {
+            throw new Error(
+              'A dehydrated suspense component was completed without a hydrated node. ' +
+                'This is probably a bug in React.',
+            );
+          }
+          prepareToHydrateHostSuspenseInstance(workInProgress);
+          bubbleProperties(workInProgress);
+          if (enableProfilerTimer) {
+            if ((workInProgress.mode & ProfileMode) !== NoMode) {
+              const isTimedOutSuspense = nextState !== null;
+              if (isTimedOutSuspense) {
+                // Don't count time spent in a timed out Suspense subtree as part of the base duration.
+                const primaryChildFragment = workInProgress.child;
+                if (primaryChildFragment !== null) {
+                  // $FlowFixMe Flow doesn't support type casting in combination with the -= operator
+                  workInProgress.treeBaseDuration -= ((primaryChildFragment.treeBaseDuration: any): number);
                 }
               }
             }
-            return null;
-          } else {
-            // We might have reentered this boundary to hydrate it. If so, we need to reset the hydration
-            // state since we're now exiting out of it. popHydrationState doesn't do that for us.
-            resetHydrationState();
-            if ((workInProgress.flags & DidCapture) === NoFlags) {
-              // This boundary did not suspend so it's now hydrated and unsuspended.
-              workInProgress.memoizedState = null;
-            }
-            // If nothing suspended, we need to schedule an effect to mark this boundary
-            // as having hydrated so events know that they're free to be invoked.
-            // It's also a signal to replay events and the suspense callback.
-            // If something suspended, schedule an effect to attach retry listeners.
-            // So we might as well always mark this.
-            workInProgress.flags |= Update;
-            bubbleProperties(workInProgress);
-            if (enableProfilerTimer) {
-              if ((workInProgress.mode & ProfileMode) !== NoMode) {
-                const isTimedOutSuspense = nextState !== null;
-                if (isTimedOutSuspense) {
-                  // Don't count time spent in a timed out Suspense subtree as part of the base duration.
-                  const primaryChildFragment = workInProgress.child;
-                  if (primaryChildFragment !== null) {
-                    // $FlowFixMe Flow doesn't support type casting in combination with the -= operator
-                    workInProgress.treeBaseDuration -= ((primaryChildFragment.treeBaseDuration: any): number);
-                  }
+          }
+          return null;
+        } else {
+          // We might have reentered this boundary to hydrate it. If so, we need to reset the hydration
+          // state since we're now exiting out of it. popHydrationState doesn't do that for us.
+          resetHydrationState();
+          if ((workInProgress.flags & DidCapture) === NoFlags) {
+            // This boundary did not suspend so it's now hydrated and unsuspended.
+            workInProgress.memoizedState = null;
+          }
+          // If nothing suspended, we need to schedule an effect to mark this boundary
+          // as having hydrated so events know that they're free to be invoked.
+          // It's also a signal to replay events and the suspense callback.
+          // If something suspended, schedule an effect to attach retry listeners.
+          // So we might as well always mark this.
+          workInProgress.flags |= Update;
+          bubbleProperties(workInProgress);
+          if (enableProfilerTimer) {
+            if ((workInProgress.mode & ProfileMode) !== NoMode) {
+              const isTimedOutSuspense = nextState !== null;
+              if (isTimedOutSuspense) {
+                // Don't count time spent in a timed out Suspense subtree as part of the base duration.
+                const primaryChildFragment = workInProgress.child;
+                if (primaryChildFragment !== null) {
+                  // $FlowFixMe Flow doesn't support type casting in combination with the -= operator
+                  workInProgress.treeBaseDuration -= ((primaryChildFragment.treeBaseDuration: any): number);
                 }
               }
             }
-            return null;
           }
+          return null;
         }
-
-        // Successfully completed this tree. If this was a forced client render,
-        // there may have been recoverable errors during first hydration
-        // attempt. If so, add them to a queue so we can log them in the
-        // commit phase.
-        upgradeHydrationErrorsToRecoverable();
       }
 
+      // Successfully completed this tree. If this was a forced client render,
+      // there may have been recoverable errors during first hydration
+      // attempt. If so, add them to a queue so we can log them in the
+      // commit phase.
+      upgradeHydrationErrorsToRecoverable();
+
       if ((workInProgress.flags & DidCapture) !== NoFlags) {
         // Something suspended. Re-render with the fallback children.
         workInProgress.lanes = renderLanes;
diff --git a/packages/react-reconciler/src/ReactFiberCompleteWork.old.js b/packages/react-reconciler/src/ReactFiberCompleteWork.old.js
index fc9414efc2796..549e3da16b035 100644
--- a/packages/react-reconciler/src/ReactFiberCompleteWork.old.js
+++ b/packages/react-reconciler/src/ReactFiberCompleteWork.old.js
@@ -138,7 +138,6 @@ import {
 } from './ReactFiberHydrationContext.old';
 import {
   enableSuspenseCallback,
-  enableSuspenseServerRenderer,
   enableScopeAPI,
   enableProfilerTimer,
   enableCache,
@@ -1066,85 +1065,82 @@ function completeWork(
       popSuspenseContext(workInProgress);
       const nextState: null | SuspenseState = workInProgress.memoizedState;
 
-      if (enableSuspenseServerRenderer) {
-        if (
-          enableClientRenderFallbackOnHydrationMismatch &&
-          hasUnhydratedTailNodes() &&
-          (workInProgress.mode & ConcurrentMode) !== NoMode &&
-          (workInProgress.flags & DidCapture) === NoFlags
-        ) {
-          warnIfUnhydratedTailNodes(workInProgress);
-          resetHydrationState();
-          workInProgress.flags |=
-            ForceClientRender | Incomplete | ShouldCapture;
-          return workInProgress;
-        }
-        if (nextState !== null && nextState.dehydrated !== null) {
-          // We might be inside a hydration state the first time we're picking up this
-          // Suspense boundary, and also after we've reentered it for further hydration.
-          const wasHydrated = popHydrationState(workInProgress);
-          if (current === null) {
-            if (!wasHydrated) {
-              throw new Error(
-                'A dehydrated suspense component was completed without a hydrated node. ' +
-                  'This is probably a bug in React.',
-              );
-            }
-            prepareToHydrateHostSuspenseInstance(workInProgress);
-            bubbleProperties(workInProgress);
-            if (enableProfilerTimer) {
-              if ((workInProgress.mode & ProfileMode) !== NoMode) {
-                const isTimedOutSuspense = nextState !== null;
-                if (isTimedOutSuspense) {
-                  // Don't count time spent in a timed out Suspense subtree as part of the base duration.
-                  const primaryChildFragment = workInProgress.child;
-                  if (primaryChildFragment !== null) {
-                    // $FlowFixMe Flow doesn't support type casting in combination with the -= operator
-                    workInProgress.treeBaseDuration -= ((primaryChildFragment.treeBaseDuration: any): number);
-                  }
+      if (
+        enableClientRenderFallbackOnHydrationMismatch &&
+        hasUnhydratedTailNodes() &&
+        (workInProgress.mode & ConcurrentMode) !== NoMode &&
+        (workInProgress.flags & DidCapture) === NoFlags
+      ) {
+        warnIfUnhydratedTailNodes(workInProgress);
+        resetHydrationState();
+        workInProgress.flags |= ForceClientRender | Incomplete | ShouldCapture;
+        return workInProgress;
+      }
+      if (nextState !== null && nextState.dehydrated !== null) {
+        // We might be inside a hydration state the first time we're picking up this
+        // Suspense boundary, and also after we've reentered it for further hydration.
+        const wasHydrated = popHydrationState(workInProgress);
+        if (current === null) {
+          if (!wasHydrated) {
+            throw new Error(
+              'A dehydrated suspense component was completed without a hydrated node. ' +
+                'This is probably a bug in React.',
+            );
+          }
+          prepareToHydrateHostSuspenseInstance(workInProgress);
+          bubbleProperties(workInProgress);
+          if (enableProfilerTimer) {
+            if ((workInProgress.mode & ProfileMode) !== NoMode) {
+              const isTimedOutSuspense = nextState !== null;
+              if (isTimedOutSuspense) {
+                // Don't count time spent in a timed out Suspense subtree as part of the base duration.
+                const primaryChildFragment = workInProgress.child;
+                if (primaryChildFragment !== null) {
+                  // $FlowFixMe Flow doesn't support type casting in combination with the -= operator
+                  workInProgress.treeBaseDuration -= ((primaryChildFragment.treeBaseDuration: any): number);
                 }
               }
             }
-            return null;
-          } else {
-            // We might have reentered this boundary to hydrate it. If so, we need to reset the hydration
-            // state since we're now exiting out of it. popHydrationState doesn't do that for us.
-            resetHydrationState();
-            if ((workInProgress.flags & DidCapture) === NoFlags) {
-              // This boundary did not suspend so it's now hydrated and unsuspended.
-              workInProgress.memoizedState = null;
-            }
-            // If nothing suspended, we need to schedule an effect to mark this boundary
-            // as having hydrated so events know that they're free to be invoked.
-            // It's also a signal to replay events and the suspense callback.
-            // If something suspended, schedule an effect to attach retry listeners.
-            // So we might as well always mark this.
-            workInProgress.flags |= Update;
-            bubbleProperties(workInProgress);
-            if (enableProfilerTimer) {
-              if ((workInProgress.mode & ProfileMode) !== NoMode) {
-                const isTimedOutSuspense = nextState !== null;
-                if (isTimedOutSuspense) {
-                  // Don't count time spent in a timed out Suspense subtree as part of the base duration.
-                  const primaryChildFragment = workInProgress.child;
-                  if (primaryChildFragment !== null) {
-                    // $FlowFixMe Flow doesn't support type casting in combination with the -= operator
-                    workInProgress.treeBaseDuration -= ((primaryChildFragment.treeBaseDuration: any): number);
-                  }
+          }
+          return null;
+        } else {
+          // We might have reentered this boundary to hydrate it. If so, we need to reset the hydration
+          // state since we're now exiting out of it. popHydrationState doesn't do that for us.
+          resetHydrationState();
+          if ((workInProgress.flags & DidCapture) === NoFlags) {
+            // This boundary did not suspend so it's now hydrated and unsuspended.
+            workInProgress.memoizedState = null;
+          }
+          // If nothing suspended, we need to schedule an effect to mark this boundary
+          // as having hydrated so events know that they're free to be invoked.
+          // It's also a signal to replay events and the suspense callback.
+          // If something suspended, schedule an effect to attach retry listeners.
+          // So we might as well always mark this.
+          workInProgress.flags |= Update;
+          bubbleProperties(workInProgress);
+          if (enableProfilerTimer) {
+            if ((workInProgress.mode & ProfileMode) !== NoMode) {
+              const isTimedOutSuspense = nextState !== null;
+              if (isTimedOutSuspense) {
+                // Don't count time spent in a timed out Suspense subtree as part of the base duration.
+                const primaryChildFragment = workInProgress.child;
+                if (primaryChildFragment !== null) {
+                  // $FlowFixMe Flow doesn't support type casting in combination with the -= operator
+                  workInProgress.treeBaseDuration -= ((primaryChildFragment.treeBaseDuration: any): number);
                 }
               }
             }
-            return null;
           }
+          return null;
         }
-
-        // Successfully completed this tree. If this was a forced client render,
-        // there may have been recoverable errors during first hydration
-        // attempt. If so, add them to a queue so we can log them in the
-        // commit phase.
-        upgradeHydrationErrorsToRecoverable();
       }
 
+      // Successfully completed this tree. If this was a forced client render,
+      // there may have been recoverable errors during first hydration
+      // attempt. If so, add them to a queue so we can log them in the
+      // commit phase.
+      upgradeHydrationErrorsToRecoverable();
+
       if ((workInProgress.flags & DidCapture) !== NoFlags) {
         // Something suspended. Re-render with the fallback children.
         workInProgress.lanes = renderLanes;
diff --git a/packages/react-reconciler/src/ReactFiberHydrationContext.new.js b/packages/react-reconciler/src/ReactFiberHydrationContext.new.js
index 94ca9e61eec15..98981e904a90a 100644
--- a/packages/react-reconciler/src/ReactFiberHydrationContext.new.js
+++ b/packages/react-reconciler/src/ReactFiberHydrationContext.new.js
@@ -68,10 +68,7 @@ import {
   didNotFindHydratableTextInstance,
   didNotFindHydratableSuspenseInstance,
 } from './ReactFiberHostConfig';
-import {
-  enableClientRenderFallbackOnHydrationMismatch,
-  enableSuspenseServerRenderer,
-} from 'shared/ReactFeatureFlags';
+import {enableClientRenderFallbackOnHydrationMismatch} from 'shared/ReactFeatureFlags';
 import {OffscreenLane} from './ReactFiberLane.new';
 import {
   getSuspendedTreeContext,
@@ -347,32 +344,30 @@ function tryHydrate(fiber, nextInstance) {
       return false;
     }
     case SuspenseComponent: {
-      if (enableSuspenseServerRenderer) {
-        const suspenseInstance: null | SuspenseInstance = canHydrateSuspenseInstance(
-          nextInstance,
+      const suspenseInstance: null | SuspenseInstance = canHydrateSuspenseInstance(
+        nextInstance,
+      );
+      if (suspenseInstance !== null) {
+        const suspenseState: SuspenseState = {
+          dehydrated: suspenseInstance,
+          treeContext: getSuspendedTreeContext(),
+          retryLane: OffscreenLane,
+        };
+        fiber.memoizedState = suspenseState;
+        // Store the dehydrated fragment as a child fiber.
+        // This simplifies the code for getHostSibling and deleting nodes,
+        // since it doesn't have to consider all Suspense boundaries and
+        // check if they're dehydrated ones or not.
+        const dehydratedFragment = createFiberFromDehydratedFragment(
+          suspenseInstance,
         );
-        if (suspenseInstance !== null) {
-          const suspenseState: SuspenseState = {
-            dehydrated: suspenseInstance,
-            treeContext: getSuspendedTreeContext(),
-            retryLane: OffscreenLane,
-          };
-          fiber.memoizedState = suspenseState;
-          // Store the dehydrated fragment as a child fiber.
-          // This simplifies the code for getHostSibling and deleting nodes,
-          // since it doesn't have to consider all Suspense boundaries and
-          // check if they're dehydrated ones or not.
-          const dehydratedFragment = createFiberFromDehydratedFragment(
-            suspenseInstance,
-          );
-          dehydratedFragment.return = fiber;
-          fiber.child = dehydratedFragment;
-          hydrationParentFiber = fiber;
-          // While a Suspense Instance does have children, we won't step into
-          // it during the first pass. Instead, we'll reenter it later.
-          nextHydratableInstance = null;
-          return true;
-        }
+        dehydratedFragment.return = fiber;
+        fiber.child = dehydratedFragment;
+        hydrationParentFiber = fiber;
+        // While a Suspense Instance does have children, we won't step into
+        // it during the first pass. Instead, we'll reenter it later.
+        nextHydratableInstance = null;
+        return true;
       }
       return false;
     }
diff --git a/packages/react-reconciler/src/ReactFiberHydrationContext.old.js b/packages/react-reconciler/src/ReactFiberHydrationContext.old.js
index 6af68fe66a79d..fd98256927847 100644
--- a/packages/react-reconciler/src/ReactFiberHydrationContext.old.js
+++ b/packages/react-reconciler/src/ReactFiberHydrationContext.old.js
@@ -68,10 +68,7 @@ import {
   didNotFindHydratableTextInstance,
   didNotFindHydratableSuspenseInstance,
 } from './ReactFiberHostConfig';
-import {
-  enableClientRenderFallbackOnHydrationMismatch,
-  enableSuspenseServerRenderer,
-} from 'shared/ReactFeatureFlags';
+import {enableClientRenderFallbackOnHydrationMismatch} from 'shared/ReactFeatureFlags';
 import {OffscreenLane} from './ReactFiberLane.old';
 import {
   getSuspendedTreeContext,
@@ -347,32 +344,30 @@ function tryHydrate(fiber, nextInstance) {
       return false;
     }
     case SuspenseComponent: {
-      if (enableSuspenseServerRenderer) {
-        const suspenseInstance: null | SuspenseInstance = canHydrateSuspenseInstance(
-          nextInstance,
+      const suspenseInstance: null | SuspenseInstance = canHydrateSuspenseInstance(
+        nextInstance,
+      );
+      if (suspenseInstance !== null) {
+        const suspenseState: SuspenseState = {
+          dehydrated: suspenseInstance,
+          treeContext: getSuspendedTreeContext(),
+          retryLane: OffscreenLane,
+        };
+        fiber.memoizedState = suspenseState;
+        // Store the dehydrated fragment as a child fiber.
+        // This simplifies the code for getHostSibling and deleting nodes,
+        // since it doesn't have to consider all Suspense boundaries and
+        // check if they're dehydrated ones or not.
+        const dehydratedFragment = createFiberFromDehydratedFragment(
+          suspenseInstance,
         );
-        if (suspenseInstance !== null) {
-          const suspenseState: SuspenseState = {
-            dehydrated: suspenseInstance,
-            treeContext: getSuspendedTreeContext(),
-            retryLane: OffscreenLane,
-          };
-          fiber.memoizedState = suspenseState;
-          // Store the dehydrated fragment as a child fiber.
-          // This simplifies the code for getHostSibling and deleting nodes,
-          // since it doesn't have to consider all Suspense boundaries and
-          // check if they're dehydrated ones or not.
-          const dehydratedFragment = createFiberFromDehydratedFragment(
-            suspenseInstance,
-          );
-          dehydratedFragment.return = fiber;
-          fiber.child = dehydratedFragment;
-          hydrationParentFiber = fiber;
-          // While a Suspense Instance does have children, we won't step into
-          // it during the first pass. Instead, we'll reenter it later.
-          nextHydratableInstance = null;
-          return true;
-        }
+        dehydratedFragment.return = fiber;
+        fiber.child = dehydratedFragment;
+        hydrationParentFiber = fiber;
+        // While a Suspense Instance does have children, we won't step into
+        // it during the first pass. Instead, we'll reenter it later.
+        nextHydratableInstance = null;
+        return true;
       }
       return false;
     }
diff --git a/packages/react-reconciler/src/ReactFiberNewContext.new.js b/packages/react-reconciler/src/ReactFiberNewContext.new.js
index 8f269a4050215..68862e568818f 100644
--- a/packages/react-reconciler/src/ReactFiberNewContext.new.js
+++ b/packages/react-reconciler/src/ReactFiberNewContext.new.js
@@ -42,7 +42,6 @@ import is from 'shared/objectIs';
 import {createUpdate, ForceUpdate} from './ReactUpdateQueue.new';
 import {markWorkInProgressReceivedUpdate} from './ReactFiberBeginWork.new';
 import {
-  enableSuspenseServerRenderer,
   enableLazyContextPropagation,
   enableServerContext,
 } from 'shared/ReactFeatureFlags';
@@ -295,10 +294,7 @@ function propagateContextChange_eager<T>(
     } else if (fiber.tag === ContextProvider) {
       // Don't scan deeper if this is a matching provider
       nextFiber = fiber.type === workInProgress.type ? null : fiber.child;
-    } else if (
-      enableSuspenseServerRenderer &&
-      fiber.tag === DehydratedFragment
-    ) {
+    } else if (fiber.tag === DehydratedFragment) {
       // If a dehydrated suspense boundary is in this subtree, we don't know
       // if it will have any context consumers in it. The best we can do is
       // mark it as having updates.
@@ -425,10 +421,7 @@ function propagateContextChanges<T>(
         }
         dep = dependency.next;
       }
-    } else if (
-      enableSuspenseServerRenderer &&
-      fiber.tag === DehydratedFragment
-    ) {
+    } else if (fiber.tag === DehydratedFragment) {
       // If a dehydrated suspense boundary is in this subtree, we don't know
       // if it will have any context consumers in it. The best we can do is
       // mark it as having updates.
diff --git a/packages/react-reconciler/src/ReactFiberNewContext.old.js b/packages/react-reconciler/src/ReactFiberNewContext.old.js
index a48c842043821..de96664e774a2 100644
--- a/packages/react-reconciler/src/ReactFiberNewContext.old.js
+++ b/packages/react-reconciler/src/ReactFiberNewContext.old.js
@@ -42,7 +42,6 @@ import is from 'shared/objectIs';
 import {createUpdate, ForceUpdate} from './ReactUpdateQueue.old';
 import {markWorkInProgressReceivedUpdate} from './ReactFiberBeginWork.old';
 import {
-  enableSuspenseServerRenderer,
   enableLazyContextPropagation,
   enableServerContext,
 } from 'shared/ReactFeatureFlags';
@@ -295,10 +294,7 @@ function propagateContextChange_eager<T>(
     } else if (fiber.tag === ContextProvider) {
       // Don't scan deeper if this is a matching provider
       nextFiber = fiber.type === workInProgress.type ? null : fiber.child;
-    } else if (
-      enableSuspenseServerRenderer &&
-      fiber.tag === DehydratedFragment
-    ) {
+    } else if (fiber.tag === DehydratedFragment) {
       // If a dehydrated suspense boundary is in this subtree, we don't know
       // if it will have any context consumers in it. The best we can do is
       // mark it as having updates.
@@ -425,10 +421,7 @@ function propagateContextChanges<T>(
         }
         dep = dependency.next;
       }
-    } else if (
-      enableSuspenseServerRenderer &&
-      fiber.tag === DehydratedFragment
-    ) {
+    } else if (fiber.tag === DehydratedFragment) {
       // If a dehydrated suspense boundary is in this subtree, we don't know
       // if it will have any context consumers in it. The best we can do is
       // mark it as having updates.
diff --git a/packages/react-reconciler/src/ReactFiberUnwindWork.new.js b/packages/react-reconciler/src/ReactFiberUnwindWork.new.js
index eb2ea2286a275..c97c3e2ebc166 100644
--- a/packages/react-reconciler/src/ReactFiberUnwindWork.new.js
+++ b/packages/react-reconciler/src/ReactFiberUnwindWork.new.js
@@ -28,11 +28,7 @@ import {
 } from './ReactWorkTags';
 import {DidCapture, NoFlags, ShouldCapture} from './ReactFiberFlags';
 import {NoMode, ProfileMode} from './ReactTypeOfMode';
-import {
-  enableSuspenseServerRenderer,
-  enableProfilerTimer,
-  enableCache,
-} from 'shared/ReactFeatureFlags';
+import {enableProfilerTimer, enableCache} from 'shared/ReactFeatureFlags';
 
 import {popHostContainer, popHostContext} from './ReactFiberHostContext.new';
 import {popSuspenseContext} from './ReactFiberSuspenseContext.new';
@@ -108,20 +104,18 @@ function unwindWork(
     }
     case SuspenseComponent: {
       popSuspenseContext(workInProgress);
-      if (enableSuspenseServerRenderer) {
-        const suspenseState: null | SuspenseState =
-          workInProgress.memoizedState;
-        if (suspenseState !== null && suspenseState.dehydrated !== null) {
-          if (workInProgress.alternate === null) {
-            throw new Error(
-              'Threw in newly mounted dehydrated component. This is likely a bug in ' +
-                'React. Please file an issue.',
-            );
-          }
-
-          resetHydrationState();
+      const suspenseState: null | SuspenseState = workInProgress.memoizedState;
+      if (suspenseState !== null && suspenseState.dehydrated !== null) {
+        if (workInProgress.alternate === null) {
+          throw new Error(
+            'Threw in newly mounted dehydrated component. This is likely a bug in ' +
+              'React. Please file an issue.',
+          );
         }
+
+        resetHydrationState();
       }
+
       const flags = workInProgress.flags;
       if (flags & ShouldCapture) {
         workInProgress.flags = (flags & ~ShouldCapture) | DidCapture;
diff --git a/packages/react-reconciler/src/ReactFiberUnwindWork.old.js b/packages/react-reconciler/src/ReactFiberUnwindWork.old.js
index 1eb4d72d98c98..260b574b264fe 100644
--- a/packages/react-reconciler/src/ReactFiberUnwindWork.old.js
+++ b/packages/react-reconciler/src/ReactFiberUnwindWork.old.js
@@ -28,11 +28,7 @@ import {
 } from './ReactWorkTags';
 import {DidCapture, NoFlags, ShouldCapture} from './ReactFiberFlags';
 import {NoMode, ProfileMode} from './ReactTypeOfMode';
-import {
-  enableSuspenseServerRenderer,
-  enableProfilerTimer,
-  enableCache,
-} from 'shared/ReactFeatureFlags';
+import {enableProfilerTimer, enableCache} from 'shared/ReactFeatureFlags';
 
 import {popHostContainer, popHostContext} from './ReactFiberHostContext.old';
 import {popSuspenseContext} from './ReactFiberSuspenseContext.old';
@@ -108,20 +104,18 @@ function unwindWork(
     }
     case SuspenseComponent: {
       popSuspenseContext(workInProgress);
-      if (enableSuspenseServerRenderer) {
-        const suspenseState: null | SuspenseState =
-          workInProgress.memoizedState;
-        if (suspenseState !== null && suspenseState.dehydrated !== null) {
-          if (workInProgress.alternate === null) {
-            throw new Error(
-              'Threw in newly mounted dehydrated component. This is likely a bug in ' +
-                'React. Please file an issue.',
-            );
-          }
-
-          resetHydrationState();
+      const suspenseState: null | SuspenseState = workInProgress.memoizedState;
+      if (suspenseState !== null && suspenseState.dehydrated !== null) {
+        if (workInProgress.alternate === null) {
+          throw new Error(
+            'Threw in newly mounted dehydrated component. This is likely a bug in ' +
+              'React. Please file an issue.',
+          );
         }
+
+        resetHydrationState();
       }
+
       const flags = workInProgress.flags;
       if (flags & ShouldCapture) {
         workInProgress.flags = (flags & ~ShouldCapture) | DidCapture;
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.new.js b/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
index e9381e709f226..aa20335cbec91 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
@@ -23,7 +23,6 @@ import type {
 
 import {
   warnAboutDeprecatedLifecycles,
-  enableSuspenseServerRenderer,
   replayFailedUnitOfWorkWithInvokeGuardedCallback,
   enableCreateEventHandleAPI,
   enableProfilerTimer,
@@ -2776,26 +2775,22 @@ export function retryDehydratedSuspenseBoundary(boundaryFiber: Fiber) {
 export function resolveRetryWakeable(boundaryFiber: Fiber, wakeable: Wakeable) {
   let retryLane = NoLane; // Default
   let retryCache: WeakSet<Wakeable> | Set<Wakeable> | null;
-  if (enableSuspenseServerRenderer) {
-    switch (boundaryFiber.tag) {
-      case SuspenseComponent:
-        retryCache = boundaryFiber.stateNode;
-        const suspenseState: null | SuspenseState = boundaryFiber.memoizedState;
-        if (suspenseState !== null) {
-          retryLane = suspenseState.retryLane;
-        }
-        break;
-      case SuspenseListComponent:
-        retryCache = boundaryFiber.stateNode;
-        break;
-      default:
-        throw new Error(
-          'Pinged unknown suspense boundary type. ' +
-            'This is probably a bug in React.',
-        );
-    }
-  } else {
-    retryCache = boundaryFiber.stateNode;
+  switch (boundaryFiber.tag) {
+    case SuspenseComponent:
+      retryCache = boundaryFiber.stateNode;
+      const suspenseState: null | SuspenseState = boundaryFiber.memoizedState;
+      if (suspenseState !== null) {
+        retryLane = suspenseState.retryLane;
+      }
+      break;
+    case SuspenseListComponent:
+      retryCache = boundaryFiber.stateNode;
+      break;
+    default:
+      throw new Error(
+        'Pinged unknown suspense boundary type. ' +
+          'This is probably a bug in React.',
+      );
   }
 
   if (retryCache !== null) {
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.old.js b/packages/react-reconciler/src/ReactFiberWorkLoop.old.js
index 5d25610f5f4a8..e2c3a76c7fc24 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.old.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.old.js
@@ -23,7 +23,6 @@ import type {
 
 import {
   warnAboutDeprecatedLifecycles,
-  enableSuspenseServerRenderer,
   replayFailedUnitOfWorkWithInvokeGuardedCallback,
   enableCreateEventHandleAPI,
   enableProfilerTimer,
@@ -2776,26 +2775,22 @@ export function retryDehydratedSuspenseBoundary(boundaryFiber: Fiber) {
 export function resolveRetryWakeable(boundaryFiber: Fiber, wakeable: Wakeable) {
   let retryLane = NoLane; // Default
   let retryCache: WeakSet<Wakeable> | Set<Wakeable> | null;
-  if (enableSuspenseServerRenderer) {
-    switch (boundaryFiber.tag) {
-      case SuspenseComponent:
-        retryCache = boundaryFiber.stateNode;
-        const suspenseState: null | SuspenseState = boundaryFiber.memoizedState;
-        if (suspenseState !== null) {
-          retryLane = suspenseState.retryLane;
-        }
-        break;
-      case SuspenseListComponent:
-        retryCache = boundaryFiber.stateNode;
-        break;
-      default:
-        throw new Error(
-          'Pinged unknown suspense boundary type. ' +
-            'This is probably a bug in React.',
-        );
-    }
-  } else {
-    retryCache = boundaryFiber.stateNode;
+  switch (boundaryFiber.tag) {
+    case SuspenseComponent:
+      retryCache = boundaryFiber.stateNode;
+      const suspenseState: null | SuspenseState = boundaryFiber.memoizedState;
+      if (suspenseState !== null) {
+        retryLane = suspenseState.retryLane;
+      }
+      break;
+    case SuspenseListComponent:
+      retryCache = boundaryFiber.stateNode;
+      break;
+    default:
+      throw new Error(
+        'Pinged unknown suspense boundary type. ' +
+          'This is probably a bug in React.',
+      );
   }
 
   if (retryCache !== null) {
diff --git a/packages/shared/ReactFeatureFlags.js b/packages/shared/ReactFeatureFlags.js
index aafe4c74d0440..db7babeba5cb2 100644
--- a/packages/shared/ReactFeatureFlags.js
+++ b/packages/shared/ReactFeatureFlags.js
@@ -13,7 +13,6 @@
 // Flags that can likely be deleted or landed without consequences
 // -----------------------------------------------------------------------------
 
-export const enableSuspenseServerRenderer = true;
 export const enableSelectiveHydration = true;
 export const warnAboutDeprecatedLifecycles = true;
 export const enableLazyElements = true;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index f2ce77374235e..5511736bef6db 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -26,7 +26,6 @@ export const enableProfilerCommitHooks = __PROFILE__;
 export const enableProfilerNestedUpdatePhase = __PROFILE__;
 export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = __PROFILE__;
-export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
 export const enableLazyElements = false;
 export const enableCache = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-oss.js b/packages/shared/forks/ReactFeatureFlags.native-oss.js
index 43855df94f90d..1ec8cb257c1bc 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-oss.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-oss.js
@@ -20,7 +20,6 @@ export const enableProfilerCommitHooks = __PROFILE__;
 export const enableProfilerNestedUpdatePhase = __PROFILE__;
 export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = __PROFILE__;
-export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
 export const enableLazyElements = false;
 export const enableCache = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
index 4283aa16e1201..bbca9a6b371dc 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
@@ -20,7 +20,6 @@ export const enableProfilerCommitHooks = __PROFILE__;
 export const enableProfilerNestedUpdatePhase = __PROFILE__;
 export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = false;
-export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
 export const enableLazyElements = false;
 export const enableCache = __EXPERIMENTAL__;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
index 938b4d136d73d..49528df4e505f 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
@@ -20,7 +20,6 @@ export const enableProfilerCommitHooks = __PROFILE__;
 export const enableProfilerNestedUpdatePhase = __PROFILE__;
 export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = false;
-export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
 export const enableLazyElements = false;
 export const enableCache = true;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
index 7ad5cc56d9d92..04a08d5d7418a 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
@@ -20,7 +20,6 @@ export const enableProfilerCommitHooks = __PROFILE__;
 export const enableProfilerNestedUpdatePhase = __PROFILE__;
 export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = false;
-export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
 export const enableLazyElements = false;
 export const enableCache = true;
diff --git a/packages/shared/forks/ReactFeatureFlags.testing.js b/packages/shared/forks/ReactFeatureFlags.testing.js
index 0f65c001e5402..dc5bd97016ffa 100644
--- a/packages/shared/forks/ReactFeatureFlags.testing.js
+++ b/packages/shared/forks/ReactFeatureFlags.testing.js
@@ -20,7 +20,6 @@ export const enableProfilerCommitHooks = __PROFILE__;
 export const enableProfilerNestedUpdatePhase = __PROFILE__;
 export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = false;
-export const enableSuspenseServerRenderer = false;
 export const enableSelectiveHydration = false;
 export const enableLazyElements = false;
 export const enableCache = __EXPERIMENTAL__;
diff --git a/packages/shared/forks/ReactFeatureFlags.testing.www.js b/packages/shared/forks/ReactFeatureFlags.testing.www.js
index 93d9860413db8..77250c1251aa8 100644
--- a/packages/shared/forks/ReactFeatureFlags.testing.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.testing.www.js
@@ -20,7 +20,6 @@ export const enableProfilerCommitHooks = false;
 export const enableProfilerNestedUpdatePhase = false;
 export const enableProfilerNestedUpdateScheduledHook = false;
 export const enableUpdaterTracking = false;
-export const enableSuspenseServerRenderer = true;
 export const enableSelectiveHydration = true;
 export const enableLazyElements = false;
 export const enableCache = true;
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
index a108f7a144b9e..db790769ddf65 100644
--- a/packages/shared/forks/ReactFeatureFlags.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.www.js
@@ -67,7 +67,6 @@ export const disableLegacyContext = __EXPERIMENTAL__;
 export const warnAboutStringRefs = false;
 export const warnAboutDefaultPropsOnFunctionComponents = false;
 export const enableGetInspectorDataForInstanceInProduction = false;
-export const enableSuspenseServerRenderer = true;
 export const enableSelectiveHydration = true;
 
 export const enableLazyElements = true;