[hosay123]

A desktop expects input devices, yes, but also there has been a wonderful need to accommodate disabled people for decades prior to the whole tablet thing, and so all modern desktops have great support for auxiliary input devices, and in the case of business software some of it is even legally mandated in order to sell to government. Microsoft has had a great built-in framework for touch/stylus driven input since Windows XP (2001).

The end result is that an on-screen keyboard or gesture input is just as capable of driving desktop software, and it's been that way for a very long time. If any aspect of the experience is suboptimal, it would be tiny widget sizes that are unaccommodating to thumb-sized input. But that's covered by inclusion of a stylus.