Apple’s mistake in a way was to push the iPad as a mac like device with keyboard and mouse, rather than develop strong UI for touch and pencil precision accuracy, and get the 3rd party developers on board and to see where it goes. If you are using it mostly with keyboard then it doesn’t make sense with all its limitations not to prefer a Mac or PC O/S.
I have been thinking about this same thing a lot lately. Back before the iPad Pros came out, I had given up on the iPad and switched over to a MBP full time. I felt like I had hit a plateau as far as what I was going to be able to do with the iPad's OS, and the only device that could take me further was the Mac. iOS had gotten better and better over the years, but then felt like it had hit a point where it was being iterated upon, not majorly improved. That ended with the iPad Pro, and I gladly switched back to that full time once they came out.
But now I've hit a plateau again. As I grew to depend more and more on my iPad as my main computer, I naturally upgraded to the 12.9" model eventually, and also got a Magic Keyboard for it the second those were available. I loved that setup so much as a laptop that I eventually stopped bothering using the iPad as a tablet and started just using it as a laptop. And that also meant that I stopped bothering with the Pencil too.
So the M1 Macs put me at a crossroads. The iPad has always been a tablet first and a hybrid device and/or laptop second. But what I had done to it was turn it into thicker, heavier, more expensive laptop than the Macbook Air. Now there was an M1 Macbook Air that had not only taken back the performance crown, but also had all the advantages of the iPad (other than the touchscreen/Pencil support). It's a laptop first, it runs cool so I can comfortably use it on my lap or in bed without roasting my skin, it's infinitely more powerful, and it's easier to carry than the iPad Pro with all the accessories attached to it.
Long story short, my iPad Pro has been shipped off to its buyer, and my M1 Macbook Air is supposed to be here next week. My iPhone 12 Pro Max is now going to be my phone and my iPad, and I'm fine with that. I plateaued on the iPad again not because I can't do what I need to do on it, but because the new Macs are SO MUCH BETTER than both the iPad and the Intel Macs that came before them. macOS once again seems like the more exciting and powerful platform, and the iPad Pro feels, dare I say, irrelevant?
That's not to say I think iPads in general are irrelevant. I love iPads, and always will. I just wonder if maybe the top end iPad should be the current iPad Air. Add quad speakers and ProMotion to it and figure out a way to keep the price down, and you have an iPad that will sell like hot cakes, even more so than it already is. Let the M1 Mac mini and iPad Air take over as the entry level laptop instead of the iPad Pro.
I feel like Steve Jobs and Tim Cook both might have marketed the iPad into a corner for several years. Tim Cook has backed off of that a little bit now, but the whole "why would you ever buy a PC again now that we have iPad Pro" has been completely negated by the M1 chip. There are more obvious reasons than ever to buy a Mac instead of an iPad Pro. If you HAVE to have a touch screen and Pencil, obviously the iPad is still the only choice. But all its other advantages are now gone.