What makes you say this? How many iOS system apps are inexorably linked to the OS itself (ie. not installed & updated through the app store)? This is a really h

What makes you say this? How many iOS system apps are inexorably linked to the OS itself (ie. not installed & updated through the app store)? This is a really hard problem. Features that you thought belonged at the system level during design and conceptualization half a decade (or more?) ago have grown to be fully-functional applications in and of themselves today. It's all too easy for us to sit back and think "I wouldn't have linked any apps so closely to the OS" but the situation probably looked very different to the original designers.