not to mention, having root is frightening
Not surprisingly, I really like Mike Monteiro's take on the iPad.
As an industry, we need to understand that not wanting root access doesn’t make you stupid. It simply means you do not want root access. Failing to comprehend this is not only a failure of empathy, but a failure of service.
Also, there's a great diagram which I won't steal for my blog but instead will mention as a way to entice you to click through.