The need to preserving state alone necessitates multitasking. When you quit an app you lose your application state. Checking your email shouldn't require losing

The need to preserving state alone necessitates multitasking. When you quit an app you lose your application state. Checking your email shouldn't require losing your application state. Apart from preserving state, being able to do things like track where I'm going via GPS AND check my Tweets are things people benefit from.