#25147 and #25917 have surfaced that the limitation of wide and full-wide widths to primarily the big decorative blocks is a little arbitrary, and that allowing these widths on every block can enable some designs, layouts, and patterns that would be desirable.

Allowing those widths on every block do not preclude explorations into refactoring alignments and layout features, but should be seen rather as a bit of consistency across the controls.

So as to not explode the width of block toolbars, wide and fullwide controls should probably not be part of the block toolbar of every block. The heading block just fits it, but the list block would not:

For that reason, the width controls should probably default to living in the block inspector, and then for blocks where it remains a primary action, they could be in the block toolbar. For the Paragraph block, for instance, the width controls are definitely secondary, whereas for an Image, it remains a primary interaction.