The Nix team doesn't allow any community proposals for making changes to Flakes because it is still 'experimental' and hasn't yet gone through an RFC. So it's 'experimental' in the sense that it might change, but the people who have suggested changes to the design are generally told that they won't discuss changes because it's not yet stabilized.

That kind of circular reasoning seems problematic.

Don't get me wrong, I like flakes, I use them for my NixOS setup, but the way that flakes development has been handled is very concerning.