Honestly what's the point given XMPP? Tried setting up Matrix, was a pain, went for ejabberd and it was a breeze. Gajim and c0nnecteasy work perfectly. Can't help but feel like if half the efforts of building Matrix went into XEPs or something we would have a rock solid IM alternative and clients by now. And tbf, can Matrix do group video calls? That's the only really useful feature missing from XMPP now, for which there's actually a XEP that recently went into a Deferred state, for a lack of participation/experiment. So, what's the point?
the original post has a full section about Matrix’s support for E2EE group video calls, which you can play with at https://call.element.io. This, and much more, is the point.