App icons within the app store are all high definition, yet so many end up looking very poor on the home screen. Even new apps will have low quality home screen icons. It's a tease, perhaps only with a retina display, but as apps are downloading the high definition icon is always displayed, with a blue progress bar overlaying it. Once the download is completed, often enough, a pixelated version of the icon is displayed. What's the deal? Can any app developers shed some light on this?