One of the biggest pros for having a file system is data portability. To a local degree that means being able to use files across multiple contexts, usually "ap

One of the biggest pros for having a file system is data portability. To a local degree that means being able to use files across multiple contexts, usually "apps". Another related effect is that you can transfer your files across devices/platforms without the need for systems to build ad-hoc/proprietary techniques to communicate with each other (i.e any iOS app that does app-to-app cooperation or how iTunes can show you files related to your apps). A lot of people feel iOS 6 will include better system-supported architecture for this so in that sense he is right we don't need a 'file system app', but iOS hasn't given us this kind of abstraction yet that works to scale.