I don't like touchscreen keyboards for the long term because I can't rest my fingertips -- not even gently -- on them like I can with mechanical keyboards.
Right now, on my regular MBP, I've got the little nubs on the "F" and "J" keys keeping my hands placed correctly, and I'm not even really looking down. I've never been able to do the same on my iPad.
Remember the multitouch keyboards you used to be able to buy as a
replacement on a Mac laptop? This was well over a decade ago, sold as MacNTouch by a company called FingerWorks. You could totally remove your standard iBook or PowerBook keyboard, plug one of these into the case, and gain a bunch of cool swipe-and-pinch gestures.
https://en.wikipedia.org/wiki/FingerWorks
http://static6.businessinsider.com/...-a-physical-product-with-a-split-keyboard.jpg
Videos are nearly impossible to come by because the company vanished prior to Youtube..
Apple bought FingerWorks and all of their tech, which made its way into the iPhone and iPad (and everything else, for that matter, in one form or another).
However, Apple's been sticking with physical keyboards on their laptops. All the multitouch gestures -- and, crucially but invisibly, palm rejection software -- are moved to the big trackpads.