doesn't "tablet mode" still work in the current releases of Windows 10/11? I do remember that not all applications supported it (either cleanly or at all).
Tablet mode kind of solves the issue for the Start Menu and the window manager.
But you’re still using applications with tiny touch targets. Plus all the parts of Windows that don’t even work with the on screen keyboard. Try typing a password in the privilege elevation prompt for a laugh.
People with Windows tablets use them with a separate keyboard and mouse in the cover, and then they use the touch screen to draw on pdfs.