What Apple did, that is distinctly different than how Microsoft went about trying to make Windows a touch capable OS, is they kept the touch interface iPad that operates exactly as it has for years, and they've added non-touch keyboard/trackpad/mouse driven input that makes it the iPad work very much like a laptop.
Apple isn't taking anything away from you, if you just want to interact with the iPad using your fingers. They're simply making it easy to interact using a keyboard/trackpad too - as an additive feature.
And Apple isn't copying Windows. Microsoft tried to jump on the touch interface bandwagon back when they recognized a lot of people and companies were shifting away from MS hardware because of the iPhone and overall Apple ecosystem and they thought they had to do something touch based. But their trying to make touch input work with a system and applications never built with touch input in mind, has been a flop for them. Their PC builder customers aren't lighting the world on fire selling convertible touch laptops / tablets and for the few devices that have that capability, all I have ever heard of from users has been that they're terrible to try to use in tablet form.
The whole idea of touch screen laptops or even desktops was and remains a terrible idea. It's neither efficient nor functional to move your hands away from the keyboard/mouse/trackpad up to a screen to do something that is easier and better to simply use a cursor to do. It's what made using my iPad Pro with keyboard folio far less efficient when writing or creating spreadsheets, as I constantly had to stop typing, lift my arm, hope I could touch exactly what I needed, then go back to the keyboard to continue typing. It's different when you're using an iPad app that was designed around easy finger-based inputs, but it isn't easy to do things like create spreadsheets using finger input. That's where it's clear you really do need a keyboard and trackpad to efficiently and effectively work.
Another thing that makes touch screen laptops a terrible idea, especially as screen resolutions keep increasing and we're viewing higher resolution images, is working on a fingerprint smudged screen. Who in their right mind wants to have fingerprints and smudges all over a large screen. It's one thing with a handheld device like an iPhone, where you can literally wipe the screen on your pant leg in 2 seconds and go back to using a clean screen.
But an iPad Pro or a 13"-17" laptop screen with fingerprints takes a more purposeful cleaning using a microfiber cloth. In fact, I bought a Pencil prior to iPadOS 13.4 in an effort to minimize fingerprints on my iPad Pro, which it did do, but it slowed my work down as I was picking up and setting it down constantly.
I don't actually agree with all of your points, but it was well thought out and written, so +1 like from me.
Completely agree RE: Windows.
I'd also say, as much as I am not a MS fan - they did a reasonably decent job with the Surface lineup in current years, as well as the Surface Hub screens for conferences/meetings (
https://www.microsoft.com/en-us/surface/business/surface-hub-2 ). But yes, it's a different plan of attack, while they tacked on 'touch' to essentially a laptop/workstation OS, while Apple kept them split into iOS/now iPadOS + MacOS/OSX and associated hardware lineups.
Also agree on spreadsheets via fingers (doesn't work well), or randomly being forced away from a keyboard or mouse to touch the screen - it's disruptive.
Where I still believe the possibility likes, eventually - consider the new Magic Keyboard. Make the OS, or MacOS, or HybridAppleOS, run on it. Use it like a laptop. Better, use it as an expansion doc, perhaps eventually with added storage, GPU, and outputs. Perhaps the dock adds heat sinks or fans if need be. (Hope not but ... )
Want to pick up the Pencil/stylus for a team white boarding session, drawing, etc. ? Remove it, grab the Pencil and off you go.
Want to just read some news, browse forums with coffee? Remove from 'magic dock,' magnetically, no style required, you're basically in 'original iPad mode' and fingers are just fine.
'One device' is possible, and it can be done well, but certainly we're not there yet, and there are various considerations and differences in specific user's needed.
I've used a Dell Surface clone for work, with pen. Yeah, not a great
tablet, but an overall OK enough laptop + pen input device (for some things - some pen input/behavior is definitely not there yet).
I'd love to be able to use an iPad Pro for <iPad consumption + laptop productivity + pencil usage>, and could make compromises if the result was 'close enough' in each, but it's not..not today, anyway.
What would it take to get there? Probably like for some others - a fair amount, for me - ideally it would wind up as a hybrid between the two, and not come about quickly(coding environments, SQL, CLI, ... ), but I'd be initially happy with being able to use the iPad Pro for normal non-dev productivity work
without requiring use of a finger, while using the Pencil or finger when not in productivity mode.
YMMV as usual - be interesting to see where things go.