It was not. Windows 8 was the best for touch. Horrible for desktop pointer based interaction.
The only thing that largely sucked from a desktop pointer perspective on Windows 8 was the Start menu, and even its biggest problem was that it was a huge departure from what people were used to on Win 7. Mouse and Keyboard interaction with Desktop apps in Windows hasn't changed very much at all between Windows 8 and Windows 10, and even in Windows 10 you had the ability to switch back to a full-screen start screen if you wanted.
Now we moved to Windows 8.1 then 10 and now 11. Which makes it horrible for touch again.
It's nowhere near "horrible" for touch. If it were, PC manufacturers would have abandoned touch screen computers a long time ago because nobody would be buying them. Instead we have a whole plethora of reversible and 2-in-1 laptops that are quite popular.
I switch between keyboard and mouse and touch on my laptop all the time, depending on what I'm doing. There are some tasks naturally better suited for keyboard and mouse (ie, word processing, spreadsheet, coding, basically anything with a lot of typing). There are very many tasks that work fine with a touch screen, especially on a hybrid laptop.
This WILL resort in the UI changing.
Maybe true, but this argument is largely a red herring. UIs change all the time. That's been a constant theme is the evolution of operating systems for decades.
Now, how those changes look with respect to touch on macOS specifically is anyone's guess. Despite what some Windows haters in these forums will try to convince you (or themselves), though, Microsoft has actually done a pretty decent job at finding a balance between touch and keyboard/mouse interfaces in Windows.
Apple should be able to learn from the 15 or so years of evolution of Windows' touch UI and not fall into some of the same traps that Microsoft fell into. Considering the fact that macOS lacks the legacy baggage that Windows has to contend with, Apple would have to screw up pretty badly to get this wrong.
This WILL cause an increase in price even if I don't use it.
Any new feature added to a computer will cause an increase in price, whether it is a better quality screen, faster CPU, better RAM, or whatever else you can think of. Yet the prices still seem to fall on these things over time. There have been plenty of inexpensive touch-enabled machines in the Windows and Chromebook world for many, many years.
You don't seem to have a problem with other Mac users paying a premium for a metal case or premium speakers or a high-end embedded webcam that they may never really care about just so you can have those things. Why should it be any different when it comes to features that you don't personally care about?