So iDEX? There have been multiple attempts at that from motorola, the nokia n900, sailfish, ubuntu touch, linux on DEX, DEX, maruOS, windows whatever, citrix,...
Sounds nice in theory but people rarely actually use it.
Sounds nice in theory but people rarely actually use it.
BTW, I've done exactly this daily with the only slightly larger Surface Pros and docks for over a decade, so the concept definitely works, and there are probably millions of people using it, contrary to your assertion.
It's a very small step from doing that with a PC or tablet to doing that with a folding phone design, and there are a few such solutions like that today. (Though they should run the same OS/interface, just morphed slightly for the hardware that's active.)
After having this setup, I will never, ever, go back to an old caveman laptop or desktop computer.