That might not be why, but the UI elements looks worst, the apps are unified under uglier UI, and by the logic of content it was an unnecessary design change with less accessibility, more complications to make boring UI that needs explanation and all for no benefit to the user. Just look at the iOS 7 news stand icon or the one that’s a red candy cane stripe versus the iOS 6 news stand icon. Who designed the photos icon and what’s it represent if not just designing for design’s sake? He made it minimalist, harder to use, and forced every iOS UI to congregate under a more flawed design. Pretty elements that highlighted the Retina display’s capabilities in the are now replaced by uglier boring design that was probably a practical scaling solution for ease of designing unified UI that was more developed friendly and less user friendly.