Did you just discover this? There's nothing new or even Windows 8 specific about it. Users have had Windows downgrade rights for a long time now.
Agree with most of your keen UI observations, especially the one above which bugs the heck out of me. They've tried their best to copy the Windows 8 frame border but not only does it look completely out of place on Windows 7, the worst part is it disobeys Fitts' Law. In Windows (all versions since perhaps 95) the native window frame has a small blank space to the right (and in older versions also the top) of the close button, BUT if the wi