Why does this have to come built into the iPod? Whats wrong with a case that's retractable or has a dock? Why not have a pair of (sun)glasses with headphones bu

Why does this have to come built into the iPod? Whats wrong with a case that's retractable or has a dock? Why not have a pair of (sun)glasses with headphones built in or something along those lines? There's a lot more generic ways to go about keeping wires untangled and from being a mess then having it built into the ipod. Plus by making it generic, it would work on a Zune or Zen or any other device out there. To avoid a "Why doesn't Microsoft do this too?" thread.