I think the author is missing something important: There is greater inventory flexibility with headphone internals than iPhone internals. Many different and ve

I think the author is missing something important: There is greater inventory flexibility with headphone internals than iPhone internals. Many different and very advanced technologies go into an iPhone. Most recently, the new fingerprint scanner was holding back the 5s. Every wrong assumption about color demand meant that an iPhone sale was delayed. (Assuming that it was even the correct storage size.) It's a world apart from speakers.