Unfortunately, I don't think we'll ever see a full blown version of macOS running on an iPad. (as much as I would be over the moon if I could just run a current macOS as is on my $2000 tablet keyboard combo, and use it like I have to use Windows 10 Pro on my Surface Pro & Go) - I doubt Apple will want to lose the monopoly of the App Store on one of its mobile devices. It would allow me to be as productive in Word, Excel, Powerpoint, etc. Even the struggle of "Files" vs macOS "Finder" is a major slowdown for me in being productive on the iPad.
I love the iPadOS UI as a touch interface for what it is, which has been the case since day one, when people would tell me "it's just a big iPhone - stupid to have", etc. But it was a major step forward in tablet UI design, being the first that didn't need a pen to operate. It's always been fast, responsive, and always something that you could just pick up and hold, and within half a dozen clicks and swipes, be where it needed to be.
But, given the choice for working and getting things done, I'm afraid the $2k tablet is still too constrained for me, and I have to revert to the Surface. I can still get a good day's use out of the Surface, which yes, is stuck with a x86 architecture. But I don't find it overheats or is the great battery eater like some have suggested. (and that's with running compliers and graphics design packages on the Surface). The main drawback is that Windows is something very different to iPadOS. But with Windows offering fully floating sizeable windows, a non-constrained file system, and the ability to run full blown desktop versions of any software I need, for productivity, it wins hands down for me.
More recently I taken a hybrid approach of taking an iPad mini and a Surface Go 3 i3 with me on my travels to get work done, which is quite effective. Even when coding.
The way things are now with Apple is that they are encouraging convergence, but through the likes of Catalyst and SwiftUI, to create "desktop class" apps. The horsepower is certainly there with the hardware, and the swap file limitation have been relaxed. But it's now incumbent on developers to bridge that gap with their new releases. Hopefully they will, and one day the iPad will become an efficient productivity powerhouse, instead of just being a very efficient utility device for me.
Failing that, please bring back a 12" MacBook with an M1/M2. The 2017 intel device was a great little device for productivity and was the same size as the regular iPad.