[NoGravitas]

For single-user XMPP servers, this is true, but on the other hand, not everyone is able to run their own server.

I will say, that even though I kind of like the architecture of XMPP better, the Matrix people have put in tremendous amounts of work to overcome the UX problems with e2ee, in particular the multidevice problem (where I have a laptop and a phone logged into the same account and try to participate in the same encrypted conversation from both).