Comment by VerifiedReports

Also you get reliable sound quality. The DACs in the iPhones were always decent. Now you have no idea what kind of quality you're going to get from a given listening device. Plenty of them are noisy POSes; my girlfriend had a Belkin adapter that had automatic gain (!) and would ramp up to blast hiss through the car stereo during quiet segments... and sometimes even during non-quiet ones.

The phones will always have to have DACs in them, to drive their speakers if nothing else. Denying customers a physical connection to them is just a dick move.