You are literally describing Windows 8, 8.1, 10, and now 11 here. This is a solved problem for Windows, which means you can run the OS on a variety of different hardware, including tablets. Some apps from the Microsoft Store are touch-first, but the majority of apps installed will simply work with basic touch interaction without configuring.
Apps don't have to be 'mouse-only mode'.
I agree with the OP,
@Aoligei - Apple simply want to maximize revenue across devices, and promote their cash cow App Store. I have had enough and am also using a Surface now (Surface Pro X).