Thank you - good and interesting response. I also wanted to note that Tim Cook seems to have popped up with a new vision overnight. He's quoted in the article linked below as saying that Apple isn't considering merging iOS and MacOS because it would lead to "compromises."
To me (and this is possibly very personal - perhaps no one else feels the same way?) the thing that makes iOS on any mobile hardware platform from a 12.9" iPad Pro to an iPod Touch is the lack of mouse support. The Apple Pencil is getting closer but it's still not there in terms of how I want to use a pointing accessory. To your point about MS and the Windows world, my wife and my 30 year old son both have a Surface Pro and essentially never use the touchscreen to interact with the machine.
Here's Cook's quote:
"We don't believe in sort of watering down one for the other," said Cook, speaking with The Sydney Morning Herald's Peter Wells. "One of the reasons that both of them are incredible is because we pushed them to do what they do well. And if you begin to merge the two … you begin to make trade offs and compromises."
https://www.macrumors.com/2018/04/19/tim-cook-still-opposed-to-merging-mac-ipad/
I honestly agree with Tim here. I can see why people would want mouse support for their iPad but IMO I much prefer the iOS experience to be different than Mac OS. I love that Apple keeps them separate. It allows each to excel at there respective tasks versus having to make compromises as Tim mentioned. I say keep them separate and let them "master" their craft per se.