...only in reverse.

For the first Windows phones, the idea was to put the "Windows" interface on a phone. It didn't work well, because using a hand-held device with a small screen and small or no keyboard is a totally different user experience than sitting at a desk or laptop. The "classic" Windows interface is very inefficient on a small device.

So now, MS is going to try to put their new (and much better defined) phone interface on the desktop. But the problem is the same. It's two totally different experiences. The phone interface will be very inefficient on a desktop/laptop device.

I don't want the same interface on both devices because I use them differently. All I do want is to be able to access the same data on both. Having access to the same data does not necessarily mean having to access it the exact same way.