This seems like such an obvious problem to solve. We're already collaborating all day but in really fractured ways. I literally don't know anyone who uses collaborative editing for actual work.
If you're someone who does use LiveShare/Zed/whatever for real (not just showing off in a demo) - what does that actually look like day to day? Pairing? Mob programming? And why did it stick for you when everyone else seems to try it once and never touch it again?