One thing I don't know is why there's no shut down option under your username on the start screen. I mean, there's lock and sign out there, having shut down there would both make sense and be easier to find.
Because no one bothered to test that stuff with real users?
Quote: Windows 7 and Windows 8 were developed in abject isolation from the outside world, because Microsoft disbanded the beta testing teams that had previously offered feedback at a very early point in development.
Wow, that explains quite a bit! It worked with Windows 7 because W7 is basically just a bugfixed Vista. And the UI of Vista in turn was mostly that of XP. But once they had to design a new UI, the disbanding of the testing groups misfired badly on them with Windows 8.
Read it aloud: Windows 8's UI had no testing! Dang, it shows.