Neither of those OSes is Windows, which has millions of users with 15-20 years of ingrained habits and tricks that work just fine for them and have for years.
It's different for Windows because Windows occupies a totally different part of the computing world.
You might as well say that Windows 8 doesn't work for Windows because Windows 8 occupies a different part of the computing world. It exists in a market where an ever increasing number of people are telling Microsoft that Windows Classic is an unfeasible product to revolve a business around.
For years techies and the media have been clamoring for the end of Windows, the end of the desktop, and the post-PC world. Now it's here and has somehow caught everyone off-guard in that Microsoft actually listened.
Perhaps if the whole thing had been a ground-up redesign, a genuine end to Windows, they'd have had more success? As it is, it's Windows 7 (or near enough) with some Metro jazz tacked on as an afterthought. It's not different enough to be exciting, simply different enough to be annoying.
It's different for Windows because Windows occupies a totally different part of the computing world.