Edit: Desktop software can be ported to other operating systems. Just because an operating system can't run a different, desktop operating system's software that doesn't mean it can't run desktop software. The CPU is used in iPads too. It is used between 3 different form factors.
Only the ‘shell’; not all the rest that make it practical. There are a lot of blog posts (a yearly one here) of people trying to code on iPads; they all end badly because Apple allows nothing. It’s fenched off. Nothing to do with lack of incentive to port Xcode; there are plenty of code apps on iPad, they just cannot run real envs (docker, anything other than toy interpreters etc) without rooting.
Edit: Desktop software can be ported to other operating systems. Just because an operating system can't run a different, desktop operating system's software that doesn't mean it can't run desktop software. The CPU is used in iPads too. It is used between 3 different form factors.