Windows 11 Mobile??

Reza_Ameri Well because they are trying to run Desktop edition of Windows (unmodified, non-patched, desktop UI is not replaced and etc...) - basically no one created for real custom mobile edition of Windows taking an Desktop Edition as base and then modding it at the core to looks like and feels like an phone - more as a phone than desktop (removing some desktop features and adding mobile features instead).

That cannot be easy done - you can trick drivers somehow and bootloader and be able to boot into desktop edition (with correct architecture) and that is also not easy at all - it requires good skilled work of course, but you cannot do all of other things to mod the Windows at that level without having access to their source code to each part of their operating system or at least the critical ones so that someone could easly replace some elements, make another UI from scratch, add mobile features and etc...

And even if someone wants to access their source code to do this, they need to keep this in mind and that is - Windows is closed source, not open source - so if they wants to access, they need to put so much effort in reverse-engineering the Windows itself to be able to do it.