My guess is that it is more because everything has lost buttons, it's a lot easier to add / change functions in software and people like more screen size for device size.
I always liked the controls for the Jetbook Lite, up/down slider, d-pad, 10 number buttons on the side, another 5 buttons around the d-pad, If they made one now with an improved screen and processor I'd get another
I must admit that I actually have no problems switching between a Sony 650, Kobo Mini, Kobo HD, And Pyrus mini. Always use the page turn buttons on the 650 instead of swipe though.
Then again, I can use most tech with no problems whatsoever, while the washing machine is a huge mystery. Why the hell do I need 30 settings and better temperature adjustment than my central heating to wash something???