Xmpp supports group chat, 1:1 messaging, you've got webtrc support for voice/video, and its extensible.
Jingle even has screen sharing (and I think a WIP remote control function).
What is missing from xmpp?
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Well I mostly run Debian, but I do have arch on a machine so maybe I don't count.
Have to agree there, it takes some effort if you're setting it up for friends and family.