I care about pixel density, because you can't improve interface definition without increasing pixel density. I think the improved interface definition is impli

I care about pixel density, because you can't improve interface definition without increasing pixel density. I think the improved interface definition is implied when people talk about pixel density, hence Apple's term,"retina display." The resolution independence of the OS is nice, but even if you use rasterized UI elements, you can still have better interface definition on the new iPhone (you just have to create a new set of elements).