Having macOS, exactly as it is today, on the iPad with the trade-off of having to buy a keyboard + mouse/trackpad would be absolutely OK with me. That way, (almost) no rework to be done on macOS.
This is where a Gruber type would tell us that "Apple would never do something like this because they don't think it's a great experience" -- like Apple gives a toss about the "great experience" anymore. Their software is mostly bug filled hot garbage.
Gruber is mentally stuck in about 2010 when it comes to Apple