iPhones and headphones
In their current form iPhones aren't very compatible with good iPhones. You need to use bluetooth. And there are no cases adding a DAC that I know of. This may not be a problem to some. But I don't like it, because:
- Headphones with bluetooth built in are more expensive, and there are much fewer alternatives than of those with a cable
- Sound quality is worse
- And you can't change one without the other.