@mntmn @eliasr Especially the Telegram and Signal part will only be covered by Matrix, AFAIK. There are very good bridges for both for Matrix, but I’m not aware of any, let alone good ones, for XMPP. Plus XMPP is basically a no-go if you need to talk to people who have an iPhone, while the Matrix experience on iOS is excellent. And as soon as you need multiple devices AND end-to-end encryption at the same time, I am not aware of any messenger other than Matrix having even tried to solve that problem (e.g. XMPP’s OMEMO needs m*n manual verifications, where m is the number of devices you have and n the number of devices the other person has). Granted, this is one of the more flaky parts of Matrix, too, but everybody else seems to have just given up on the problem entirely, while it mostly (not claiming always, but mostly) works with Matrix. The second best multi device experience with E2EE after Matrix seems to be having one master device handle keys and then other devices just using that to hide the fact that there are multiple devices.
@eliasr i'm willing to compare it with the xmpp experience in my parallel reply in this thread, but i'm somehow skeptical about matrix, can't really put my finger on it though