The new Retina MBP poses a lot of questions. It's a great thing that you can have so many pixels on a relatively small screen, as it allows huge amounts of detail. However, screen elements that are bound to be a certain number of pixels in size will appear smaller than they were intended (a 100 x 100 pixel image will be the same number of pixels, but 4 times less the physical area than on the previous MBP). So I do understand that the high pixel density causes some problems for apps that aren't designed for it. But what if I'm okay with that? What if I don't mind reading small text, and clicking on small buttons? In that case, in theory, wouldn't it be possible for every app to potentially make use of every pixel on the screen, without having to resort to pixel-doubling? Apps would already work on a huge external monitor that may have the same number of pixels as the Retina MBP, so is this limitation purely arbitrary by Apple? Basically, is there going to be a flag in the app that says "Yes I'm ready for the Retina resolution, I will increase every interface element to compensate for the small pixels", otherwise OS X will deliberately make the app think that it's running on a standard-resolution screen? I'd love some clarification! Thanks.