Unfortunately OP, tablets that had computer based OSes failed. Microsoft tried primarily and didn't spend any time making Windows initiuative to the touch screen. Lazy fit a small motherboard behind a screen and hope for the best made it unusable. Also, the tech was still too new and expensive.
Why would you want all that power in a 10 inch screen? You'd get frustrated and would go back to a powerful laptop. Again, this is what happened before and Microsoft pretty much killed the PDA Market with a lazy mobile operating system.
I know iOS seemed like the lazy port, but it made more sense than to try and fuzz a sophisticated Mac OS X desktop OS onto a under powered device and sacrifice battery life. I'm sure over time iOS and Mac OS X will merge and everyones wishes will become true.
It's a trade off of balance. iOS offered that after Apple succeeded reigniting the smartphone with a simple OS which grew into a software powerhouse of expandable apps that were easy to access. I made the mistake of hoping of a slimmed down version of OS X and slatted Apple using iOS to make big iPhone. After using one, I saw why Jobs made the brave call to expand iOS.