Doktor: Windows 8 & 8.1 are not "popular" at all, it was bundled with machines and people HAD to buy it. If there were a CHOICE involved, I'd say MOST people would have chosen just about any previous version of windows compared to Windows 8/8.1. The corporate example I gave was just one of people who had a choice. I bet you OEM sales paled in comparison to people buying the Windows 7 in terms of percentage. The weblink doesn't validate people who actually WANTED Windows 8 or are satisfied with it, so the numbers are just noise. Look at who has a major shares of ISPs in America and Comcast is most likely among them, but if you try to sell "people like Comcast" based on mere numbers, I have swampland in the desert for you. We all (should)know Comcast is the Devil in disguise as an ISP.
Yes, under the hood 8 was more efficient (as is 10). Yes, UEFI provides faster boot times. But the workflow was ****(unless you have a touchscreen, then I think it works a lot better) and thus people didn't want it. And if any person can show me on windows 8/8.1 how to change to a "classic" start menu NOT using a third-party app on a go-to meeting or the like, lunch is on me (no B.S. links on "how-to" ). That has been 90% rectified with 10.
Still, 10 isn't a game-changer enough to rush to anything. There are still plenty of issues being worked out. If one is building a new machine, then Win10 all the way. If you have a 4 year old DAW that still isn't hitting rim on resources, then you shouldn't rush out because it isn't that major.