No hate, genuine question... why do people use #Matrix over #XMPP?

Aside from "XMPP is old" I don't see any reason to favour Matrix. I also don't see XMPP being around long enough to have a strong ecosystem that's constantly built on to be a bad thing.

From a #selfhosting perspective XMPP is far easier to run as well.

For E2EE they both use OMEMO.

And ofc it's in the name, XMPP is extensible.