If you like the tablet way of working, phone os...
I freaking hate where it's going. I'm a super user, I'd rather go back to commands then go forward towards having to fill in a flash based questionnaire after having swiped 16 mood smileys to set my background color to black
Sounds like you're describing Windows 8 which had some horrible touchscreen elements, but as a system it was very fast and very slick. Windows 10 is restoring stuff like the start menu, but it will have all the speed of 8 and hopfully more. So at this point in time I can see no reason why someone would not use it. Unless they enjoy waiting longer for their system to boot. Plus anything before windows 8 is pretty ugly man, especially with the basic theme.
Last year I remember seeing a preview that allowed you to have multiple desktops and taskbars, which looked fucking sick. They better follow up on it. They're also working on decent web browser this time, one that isn't dogshit. They better add some GIF support and mutiple tabs for the file explorer. Waaayy overdue now.