Apple is so far up it's ass on this whole "it's all wireless in the future and the future is now" bullshit...
Bluetooth is great, but battery life and size are often fatally problematic to the notion of "just get bluetooth headphones" is some kind of universal solution rendering headphones with cords (btw the headphone jack is also a *universally compatible data port*) obsolete and somehow justifying Apple's design strategy and marketing on these products.
Let me address this now, people will definitely comment, "But I have used bluetooth headphones for years and the battery life and sound quality are sufficient"...that's great, but it's not evidence that proves this is a good design decision.
Bluetooth headphones are caught between wanting to be as small as possible, have longer battery life, and not teathering them for convenience somehow (b/c then might as well use a cord!). It's what happens when you let marketing drive design, an obtuse impass where no solution is right. Wireless headphones with 8 hours of battery life is not enough for many, many users. For many various reasons. It really is noteworthy that the smaller they get the more they would benefit from cords, which are the whole thing they attempt to avoid.
We are far, far away from wireless headphones being a de facto replacement for wired headphones such that we can just discard the headphone port.