Originally Posted by Stetrain
For what purpose?
I guess it would have been a bit better for video. The biggest difference I see with retina on iPhones and iPads is how text is rendered. I don't think anyone is going to be doing a lot of reading on their nano.
Even just swiping through icons, just looks more like everything is drawn on, instead of looking at a screen.
Again, not a big deal, many might not care, but I'd imagine loss in battery life/increase in cost would be so minimal I'm surprised Apple didn't just do it.