What makes you say that? Have you ever used Windows 8 for any length of time?

I have it on 2 tablets and one of my workstations and to sum up my experience with it: It's awesome! Nothing else even comes close.

It all starts with the most basic interactions. For instance - there's no other window manager that lets you completely control the OS with just the keyboard and in such a consistent, logical and discoverable way as Windows.