Apart from all the other things everyone mentioned, wired headphones never really become technically obsolete. I can still connect my 15-year-old pair of headphones to a laptop, and they work just fine. Sure, I swapped cushions a couple of times, and the headband is all new leather, but the sound is great.

A pair of BT headphones from 15 years ago, even if they worked (which in my experience, they don't), would use an outdated audio codec- no one in their right mind want to listen to an SBC now