I may be mistaken but it does sound to me as if you haven't actually tried Windows 10, which may explain some confusion.
True - as I said, when one of our sons gets his desktop set up again, I'll take a closer look

For now, from what I read in reviews and from users, there seems to be divided views, so I'll wait until I can try it.
Windows 10 can run in either desktop mode (as it would on a normal computer) when it acts much like any other version of Windows, or in tablet mode (as it would on a tablet) when it acts more like a tablet OS. And the great thing is that on these hybrids with detachable keyboards, or screens that fold back, it automatically switches to the appropriate mode.
All this talk of it being a "tablet operating system" is just that; just talk. That was certainly more true of Windows 8, but Microsoft have learnt their lessons from that.
All makes it sound more user friendly then!
I do like the look of the Surface Pro because I always prefer a keyboard & mouse to prodding at a screen
but I wonder if they'll (computer company) install W7 if I need a new computer.
Few companies will be offering Win 7 on new devices so you may have to jump at some point if you don't own a "full" copy of Win 7 or are not up to installing it on new PCs (it is also possible that some hardware on new devices may not have Win 7 drivers in the coming months/years).
I seem to recall asking them about having an option for W7 when I do need a new computer, and think they said exactly that.
Also, MS charge them a lot more once they have a new o/s available.
No saying when this computer will start to wobble - it's had a lot of use - so the longer it lasts, the less time for support of W7!
Don't suppose there's a 'virtual machine' for W7?
Win 10 itself is actually quite good on a non-touch device. It is much less geared to touch than Win 8 was.
My reluctance at the moment is I have had minor issues on all 3 devices I have upgraded - one actually is a major issue but I haven't bothered sorting it yet. However, give it another 3-6 months and hopefully MS will have improved it further. I will upgrade all of my devices before the 12 months is up (unless of course MS announce an extension in which case I might leave it longer).
Can't see me changing to a touch screen if I still have a standard desktop, so perhaps I'll find it OK when the time comes.
As you say though, wonder what they'll be challenging us with next