With the failure of windows 8 now official and your links being old news I think it's possible there might have been some changes in direction over in Redmond recently, one can only hope they finally got back on the right track but I'm not holding my breath, Ballmer is still there.
Your bias against the OS does not make it a failure, or an "official" failure. Whatever that means. Take a look at the job posting (that was posted less than a month ago, mind you):
We’re looking for an excellent, experienced SDET to join the Core Experience team in Windows Sustained Engineering (WinSE). The Core Experience features are the centerpiece of the new Windows UI, representing most of what customers touch and see in the OS, including: the start screen; application lifecycle; windowing; and personalization. Windows Blue promises to build and improve upon these aspects of the OS, enhancing ease of use and the overall user experience on devices and PCs worldwide.