Maybe the answer is trivially "the sort of person who can afford to buy $1k+ headphones", but this comment makes me immediately think "what sort of person buys $1K headphones and then buys a phone they can't use the headphones with?".
More seriously, why don't you get a better phone? (Or carry around an audio player?)
Took a road trip last summer with an iphone X as the audio and GPS, boy what an annoyance. GPS drains battery like nothing else, so I had to keep cutting music to charge the damn phone. Why couldn't apple make a pass through charging dongle, this one is so dumb.
More seriously, why don't you get a better phone? (Or carry around an audio player?)