One use case I'm psyched about for this - shared virtual whiteboarding for remote workers. No traditional apps have been able to reproduce the feeling of being in the room with a small group, collaborating on a shared whiteboard, feels like a huge opportunity!
They'd have to do a lot better than anything I've experienced. There are loads of these whiteboarding apps, including a first party one from Meta and they all suck when you try it.
If you carefully look though you'll see they don't demo shared anything. No people playing games together, watching movies together, literally anything. There's something missing here in the story, I don't know why they would have left that out. I wonder if you really can't do it.