Bottom-line: iOS should never have been a thing; it's a crippled OS which was never intended to be a replacement for a full desktop OS. Except that it not only IS a thing, it's become a BIG thing. That's Apple's problem:
Apple puts macos on iPad, it becomes an instant success, Apple can instantly compete with Windows touch screen tablets and everyone wins. EXCEPT, of course, iOS developers because who wants a half-baked OS when they can have the real thing? iOS will go away and all of that development money, time & effort on iOS apps & the OS? Gone. Wasted.
Timmy Cook doesn't want that grief, Apple doesn't want that grief; that's why MacOS will never run on an iPad and, consequently, why MacOS will never have a touch interface.
But can't MacOS be taught to speak iOS? That's what they're in the process of doing BUT the problem is the iOS interface. It's integral to the iOS apps, of course, and it's completely incompatible with the MacOS gui We've seen what that looks like, and it ain't pretty. So, no.
It is an absurd, crazy bed that Apple has made but now they have no choice but to lie in it.