Do you use Windows 8? While not perfect 8.1 is a big update and brings a lot of functionality. I use it everyday and find it a very stable OS. Please quantify what exactly is a mess with windows 8.1.
I'm not saying Windows "8.1" in general is a big mess, I'm referring to the metro UI. That's still the same. Some of the things that I just don't care for is the way Windows 8 handles PDF's. Taking you off the desktop into a full screen that's complicated to get out of. To read PDF's on the desktop I have to install a 3rd party PDF reader such as Adobe. That's back to Windows 7 then. On the Mac I can use Apple's Preview app and read PDF's right on the desktop.
There are many little things I don't care for on Windows 8/8.1. It's all the same when it comes to Metro.
I'm all for change but when change hinders workflow then it's not good change.
This is exactly just ONE of the reasons I didn't get an Xbox ONE, but rather I bought a PS4. I didn't want to deal with the Windows 8 UI. My buddy has an XBOX ONE and he hates the Windows 8 Tile UI. I tried it a few times on his Xbox ONE. Annoying and complicated for what is suppose to be a gaming system.