I don't think that's what he means. It's just neater than having your mp3 player sat on your passenger seat and a cable running out to your dashboard which then disconnects itself every time you turn a corner meaning you then have to reach down and retrieve it from the footwell as you're driving along the motorway.

Nobody in their right minds would think that was a safe place to keep your ipod when you're not in the car, especially seeing as the faceplace detaches leaving the 'pocket' in plain sight...