add warning

pandas/core/generic.py

@@ -3278,6 +3278,15 @@ def to_latex(
         \bottomrule
         \end{{tabular}}
         """
+        msg = (
+            "In future versions `DataFrame.to_latex` is expected to utilise the base "
+            "implementation of `Styler.to_latex` for formatting and rendering. "
+            "The arguments signature may therefore change. It is recommended instead to"
+            "use `DataFrame.style.to_latex` which also contains additional "
+            "functionality."
+        )
+        warnings.warn(msg, FutureWarning, stacklevel=2)
+
         # Get defaults from the pandas config
         if self.ndim == 1:
             self = self.to_frame()