I think you’re missing a forest for the trees. Android desktop and iPadOS are the same thing. Next-gen OSes with advantages stemming from their different paradigm at the cost of control/freedom. It’s happening slowly but IMO the end game isn’t to merge macOS with iPadOS, it’s to make macOS obsolete and deprecate it once possible.
I don't disagree. I just don't think these "next-gen OSes" are going to stand in the long run. I'm optimistic that the current situation where we're buying $1000+ devices, handicapped, but perfectly capable of much more, is gonna change sooner or later. At the moment, Android desktop seems like the most likely candidate, it could see a lot of 3rd party support.