https://www.wired.com/story/apple-macpad-ipad-mac-merging/
https://news.ycombinator.com/item?id=40368439
And also I was at WWDC 2019 where they literally said in a Q&A they weren't making developer tools available for iOS because they wanted people to use MacOS for development.
There is literally no difference in software between any of them anymore, except the manufactured kneecaps that they won't allow certain devices to produce under.
Android had all this over a decade ago. It's just a fact.