Xmpp definitely wins in privacy. What is there to privacy more than message content and metadata? Matrix definitely fails the second one, and is E2E still an issue for public groups? I don’t remember if they fixed that.
XMPP being a protocol built for extensibility means it will be hard for it not to keep up with times.
Okay so how does modern XMPP protect this? When I last used XMPP, some (not all) clients supported OTR-IM, a protocol for end to end encryption. And there wasn't a function for server stored chat history (either encrypted or plaintext).
Have these issues been fixed?