That would be wonderful, now that I think of it. The only hard problem would be the simulator, which would probably have to run on bare metal, or as a virtual machine.
Personally I wouldn’t want to be stuck with simulators only in development. Apple’s iOS simulator is pretty good, but it has quirks not shared with real hardware and its performance isn’t representative of real hardware at all.
Yeah, like not being able to emulate the MacBooks webcam. It's pretty dumb.