Is there a client that does that? Sorry I lost track of the different clients. But I’d like to try. I know Eternity (which I use on my Android phone) and the default webui can’t do that. But I haven’t tried all the options.
I don’t quite get your wording. If you mean similar communities should be merged in all cases, I think I’d disagree. People might want to subscribe to a specific community. And it’d be complex to figure out moderation etc, since the root of the platform is a federated architecture and this somewhat goes against that. I think it’d be more a UI / client feature, tied into a cross-posting mechanism.