What problem does this address?

In the block editor, Layout has its own panel in the block settings sidebar. However, some layout-related controls such as block spacing, and width/height for flex layout children, are under the Dimensions panel instead:

In addition to that, in the Global Styles interface, all the dimensions controls are under Layout:

What is your proposed solution?

Ideally we'd have consistency between where the controls live in the block editor and in global styles, and all the layout-related controls sitting close together so its easier to make changes to them. I would be happy to see all these controls in the Layout panel 😄 Opinions welcome!