I’m very thankful to Roman for creating the Conditional Blocks Plugin (https://github.com/rasteiner/conditionalblocks). The ability to limit blocks where some blocks can be used is so needed.
I have some blocks that only make sense within a 1-column layout. But currently that same block can be put into a 4-column (or any size layout), which breaks things both in the panel and in the front end.
This functionality allows me to designate what layouts a block can be used within. It’s such a good feature and feels natural that I think it should be part of the Blocks field.