I usually use wireless headphones nowadays, but there are still plenty of instances where I'm happy to have the headphone jack. Random parties where someone needs to play music via the aux cable, going somewhere with only some small wired headphones in my pocket because I dont have space, etc. For me it's still quite important that my next phone has one.
On the one hand, you make a compelling point for a headphone jack. On the other hand, you can just create a collaborative queue on Spotify or whatever music app you are using.