This is a bit overblown, and few of these features constitute a “moat” than can’t easily be stolen by competitors. For me, and having gone through a thorough evaluation of Slack, the best tool of this lot is Flowdock, in part because because of automatic thread management.

There is a new feature that may well be a “moat,” but you don’t mention it: The integration between Slack and ScreenHero. This could be a game-changer — the integration provides for a jump between a conversation and a shared screen session.