Sure, the systems are similar enough on kernel level (and I also want to run macOS on my M1 iPad Pro 11", the SoC is identical to M1 Macs :)) - but then the use

Sure, the systems are similar enough on kernel level (and I also want to run macOS on my M1 iPad Pro 11", the SoC is identical to M1 Macs :)) - but then the user would have the hassle of getting an external touchscreen to work with a keyboard-oriented computer. I think that Apple's multitouch implementation helps a lot to make iOS/iPadOS as comfortable to use as it is right now. An external touchscreen, possibly connected via USB, will probably have higher latencies and maybe also less precision. I can't imagine using i(Pad)OS with mouse and keyboard only right now, though I know it's possible.