The point is that, from my perspective, the value proposition rapidly diminishes when you start needing to special case things to live inside the nixos configuration world.

Other people might be getting different benefits.

(Really this is just the configuration file vs language conflict, again. Oh, this is too complicated, make a config file, oh my config file can't express this special case lets add language features, why am I using a config language instead of a read language, oh this real language is too complicated...)