QuoteOne of the problems we’ve faced working with hivemind is that sometimes we find some functionality that seems “questionable” in terms of usefulness, so we’d like to drop it.

When it comes to this kind of thing you simply set it to be depreciated but supported with an announcement along with it and then it can be flagged for actual removal later down the line. That is if it's something that quite obviously 'useless' or it's purpose is unclear. You'll usually find that those who do for some reason use a questionabley useless feature will quickly stop using it.