Description

Originally raised by @mcsf in #16283 (comment):

The only other thing I see is exploring what kind of awareness the editor should have of blocks that are a variation, and how the editor would validate whether a block modified by the user still conforms to the variation or not. This exploration would be focused less on technical feasibility and more on identifying pitfalls and defining limits to how smart the editor should be about this. This is because I think there could be some interesting convenient applications for users, but this could also be opening the door for something quite messy.