

XMPP is a shitshow of its own, very fragmented architecture. different incomplete implementations. each server can chose which features (extensions) to turn on and which not) so you can’t be sure that the person you are trying to talk to on the other server can have access to the same features, like threads or voip.
I have previously read that omemo 2 implementation is insecure. my previous experience with it 4 years ago made me give up after encrypted messages were getting lost when messaging between different clients
there is no one flagship app for XMPP that works cross platefrom and has all features implemented. heck I can’t even find a windows that support voip. and their will be none. cause xmpp has lost all traction.
As for Movim, I hate using web apps. bad user experience in general. add to that I don’t remember it ever having been audited
Me with a stick poking at LinuxMint : hey, wake up, do something, you have piled-up enough money under the bed already