And we could limp by with an XMPP room for chat and then a link to a Jitsi or Mumble or something when it’s time to do something. But there’s something tight about having the “just call” button right there, tied to the chat you’re already in, and in being able to see “huh Alice and Bob are playing GAME right now. I should pop in!”

XMPP can do actually that with the Movim client! It’s able to do group voice calls, group video calls, screensharing (now with audio as long as you’re using a chromium based browser), and even has a blog functionality built in :D