I need a headphone jack. My car doesn't have an aux input (I have to use a cassette adapter), let alone Bluetooth. It's 20 years old, yes, but it's not that uncommon to have a car that old.

More importantly, even if I didn't need one I would still want one. A headphone jack is a universal connection for audio, Bluetooth is not. And wired headphones are strictly superior to wireless headphones, as they don't need to be charged and can't be lost as easily.