There are exceedingly few phones that have them anymore - particularly more powerful ones. I prefer a headphone jack because I don't have to juggle keeping everything charged long enough for when I want to use it.

A prime example is when I go to sleep. I live on a somewhat busy street in an apartment facing said street. I have noisy neighbors. My spouse is used to sleeping with the TV on (there are reasons for this which I understand) - thankfully, the screen doesn't have to be on. As such, I use wired earbuds that block out most external sound, along with an audio track I've been using for many years on a loop to put (and keep) me to sleep. Show me any wireless earbuds that'll last the night, block out sound, and not be too big to lay upon comfortably since I'm a side-sleeper (let alone not have controls accidentally activated by laying on them).

ETA: Never mind that my Bluetooth earbuds always seem to develop a problem keeping contact with their charge contacts in the case before long, so it's not infrequent that I go to use them and they're dead when they shouldn't be.

Do not assume contemporary low-end quality would the flagship quality. Flagships like LG when they had jacks had high quality DACs—even current Sony phones are good. Adding a jack to the device means less things to dangle & put stress on the already kinda weak charging port; this takes up little room & does not affect waterproofing. Almost all other gear for consuming media has a jack, it is pretty much a conspiracy to push folks into perpetually buying Bluetooth earbuds when the batteries die.