@whitequark@social.treehouse.systems Actually, it has. The difference is that, unlike XMPP and other centralized IMs, presence in Matrix is part of room state synchronization. But because of this, presence is heavy and far from scalable (see https://github.com/element-hq/synapse/issues/9478). Oh, and I forgot to mention that IRC also lacks a roster (a.k.a buddy/friend/contact list). But depending on your needs, I think this can be both good and bad.