good question .. why?
And still, 10-12 hrs a day on a touch screen on a desktop is NOT a workable option. Nor is pinning everything in the world to the taskbar.
The tile screens are a clutter disaster and full of useless junk. The required mouse gestures to bring up screens or functions decreases workflow.
When W8 allows me to completely clear/delete all screens of tiles (obviously excluding system functions) and then ONLY put back the ones I want to use, then I might consider it - and not in touch screen mode. Right now, it reminds me of my Droid that came 'equipped' with about 100 apps that are locked onto the phone that I'll never use - and can't remove unless I root it.
I generally go with a totally clean install .. devoid of bloatware. That's no longer possible.
One of the original suggestions to offer a version with a choice on install of 'classic' or 'Metro' was ignored. MS went for the total 'entertainment/consumer' option and appears unwilling to change. Expending all the effort to catch up to that market at the expense of losing the enterprise means losing both.
