Interesting - I thought they would know that anyway, as OS X should realize when I plug in a headphone.
If Apple's vision is a world without wires, I'm all for it given the mess of wires on my desk.
For example, I still use a wired mouse because it never stops working. I use wired headphones with my work laptop and home desktop because I never have to hear those fatal words "Battery Low!" just when I want to settle in and focus on something for the next few hours.
Not to mention that cable in mice are extremely annoying during usage.
If you are listening to your own music locally, iTunes does not phone home on your usage.