This is what I've been waiting for ever since I found out about Steem. It's nice to have a place where anything goes like steemit.com, a place with true freedom of speech, but that also empowers toxic behavior. So if you want to get away from flag wars and all that good stuff you need moderated communities. Now it looks like it's finally here.
Steem is basically Reddit and Tribes are subreddits with their own rules, only more robust. So we end up with a better Reddit, who doesn't want that. :)