I am a user, and Arc's implementation is one of the very few that I've actually found useful.

I often use it to ask a question about a page's content, especially if there are no obvious keywords to find what I'm looking for that don't appear dozens of times. It's great for technical documentation.

Arc also "unships" things pretty regularly. If the features aren't being used, in not too long someone will suggest removing them and they'll end up being removed.