"An Absolute Requirement"

I agree with Marco, but his phrasing is dangerous, and conflates ‘design’ with how it looks. You no longer need to hire a visual designer to make an app look at home on iOS 7, true, but interaction design is still very much design. …

Design is how it works. If you were only hiring a designer to make your app pretty, you were already focused on the wrong problem.

Spot on.