it's the GUI, stupid
Of course I don't have any meaningful stats about this, but from my personal experience and (IT) people around me the problem is not about what's under the hood. There is no question Windows 10 is quite stable, and the jury is still out regarding performance (OS and apps get more and more bloated over time but hardware has progressed a lot).
But Windows 7 was, as far as I'm concerned, very stable and mature as well. I kept it until last week. Honestly XP was not too bad either.
The big problem with Windows 8/10 is indeed the GUI. And sorry, but it's not just about "oh they changed my menus, I'm all miffed" (holds breath, turns red) as you seem to imply. It's just crappy and unfinished. I'm quite afraid of 11.
I've been tinkering with computers for ~35 years, as a hobby and then a job. And I like to think I'm not (yet) completely senile.
So why did it take me around 5-10 minutes the first time to find where to set the bloody screensaver, understand why the screen would go black without showing the chosen screensaver ? Oh yes, let's not forget the fact that the settings are shown in a Windows 7-style window (?).
This is a mundane example, but shows the "philosophy" (or lack thereof) of this GUI. I could go on about the network/wifi settings. At times it feels like the interface has been designed by Terry Gilliam. Or Terry's chimp.
It has nothing to do with "looks" or taste, just plain functionality.
This is Microsoft, a company that's more than 50 years old, with thousands of (I guess) talented employees, sh*tloads of cash, there is simply no excuse for them to offer (impose ?) such a crappy, nonsensical and illogical UX to millions of users/customers/businesses.
"Suck it up" ? Yep, we have no choice if we want to run some specific workloads. But we shouldn't have to put up with this.
Granted, I haven't really tried 11 yet, but the 10 "experience" is not too encouraging.
Aaaand I'm spent...