it's more a question of the complexity in both technical debt and design. Things need to be refactored, and it ain't chittlins.
The fundamental concept of NixOS is to be fully reproducible and the big gripe with flakes is that it supposedly isn't - or that it breaks with a core concept.
There's been problems with governance, internal turmoil and repression there of.
It's as if the ship of Theseus was a man'o'war with generals in disagreement on how to build and progress.