[TechnoFou]

No offence, but a designer posts a drawing on Dribble. A UX Architect, explains every step in the process and how and why it works that way. Notification Center gives you information that happened, but not that you might need and the two finger pinch is to limit the number of buttons required for the action. It is also a natural action to make something bigger to see more, like a picture. The beauty with this concept, is that if you don't like it, you don't have to use it, everybody's happy!