That's the job of the GPU driver, mostly.
> 3D everything
That's the desktop compositor. Windows 7 already had one and ran on 1 GB of RAM.
> accessibility
Not everyone needs it, so it should be an optional installable component for those who do.
> fancy APIs for easier development allowing for more features
That still use win32 under the hood. Again, .net has existed for a very long time. MFC has existed for an even longer time.
> support for large amounts of devices
No one asked for Windows on touchscreen anything. Microsoft decided that themselves and ruined the UX for the remaining 99% of the users that still use a mouse and a keyboard.
> backwards compatibility
That's what Microsoft does historically, nothing new here.
> browsers are almost unrecognizable in featureset to the point they resemble an OS unto themselves
No one asked for this. My personal opinion is that everything app-like about browsers needs to be undone, yesterday, and they should again become the hypertext document viewers they were meant to be. Even JS is too much, but I guess it does have to stay.