The problem with external DACs is that they don't easily fit in your pocket and cost a pretty penny. Cheap headphones will get even worse and good ones will get

The problem with external DACs is that they don't easily fit in your pocket and cost a pretty penny. Cheap headphones will get even worse and good ones will get more expensive for including a good DAC. There are no winners in this game except for Apple, which can push more licenses and proprietary accessories.