Some of the issues, like multiple communities of the same subject were true of reddit in the beginning, and perhaps time will solve the issue, but your right in discovery being terrible. I still don’t know what the Apple community is. Half the time using iOS the app fails to load search. Other times there doesn’t appear to be many subscribers on any over any other. Subscribing to multiple just gives me the same topics over and over again. So I end up with a feed that doesn’t refresh much and has many duplicates. Not a ton of discussion or self posts either.