I am really interested in this, and certainly have done the equivalent thing locally, at times in my career, by just cramming 2-3 developers in front of the sam

I am really interested in this, and certainly have done the equivalent thing locally, at times in my career, by just cramming 2-3 developers in front of the same monitor and maybe swapping the keyboard back and forth as we work on something tricky/weird. That said, I don't think anybody is proposing this as the default working mode for writing software. It's a tool for specific kinds of situation.