ahalpert
Major Contributor
As to 2-piece, as Abe said, at some point it does begin to look like an actual camera. But these days, one can think of a small one-handed jib holding the interchangeable camera module with either a wired or wireless connection. The other potential is not just an interchangeable lens mount but an interchangeable sensor camera.
I could see that. I'm already doing smartphone control for my camera mounted on a gimbal. (But I still use a wired monitor as well for reliability/resolution/latency/screen size/exposure and framing tools.)
but the point is that if you add tools and accessories, then you can no longer say that a consumer phone is all you need to shoot, everything in your pocket. Which is fine.