Even if the features are ignorable, they have consumed development time and attention to get there.

That's true of any feature you don't use. And while it's nothing new for people to get upset about work being put into features they don't care about, I've never seen anything like this level of vitriol. In particular I never saw anyone say they won't use a piece of software at all if it contains a particular optional feature, until LLMs came along.