Quote Originally Posted by Eric View Post
DPI in itself isn't so much an issue, if you have high/low resolution assets for the high/low DPI cases, you can just scale everything.

However much more problematic are:
* aspect ratio (4:3 vs 16:9 vs every variation that exists), leaving the unused space black works, but isn't too satisfying...
* device size, the ergonomics of a phone and a tablets are different (in terms of real world hand and fingers), and even amongst tablets, you don't handle a 7" tablet in the same way you handle 10"

I'm afraid that some radical UI redesign are necessary in many cases, just like console gamepad UIs don't match desktop mouse+keyboard UI.
hmm...all interesting points Eric, thanks!