You don't miss it until you do. When you are trying to join a meeting and your bluetooth headset absolutely refuses to work (and yes, even the fancy Airpods Pro do that occasionally), you wish you had the ability to just plug in an old-fashioned, analog headset. Which you can pull easily, with no fuss, from many devices, including computers and gaming consoles. Quick, no pairing required. No battery issues.

Analog headphones are also very cheap(good if you are not in a rich country), and will always be cheaper than bluetooth headphones, as there is minimal hardware required. You can quickly pick one up even from a shady street seller and you know it will work(longevity might suffer, but again, cheap).

The only problem with the headphone jack is that it is a very old standard. It's big connector, and takes significant real state inside a phone.