I'd buy one if it had a headphone jack!
Would you reeeaaally? If you really wanted a phone like this, you'd just get the tiny USB-C to Jack adapter. How much of a chance that you'd find some other detail that's not ok if it had a jack?
2. USB-C adapters are one extra thing to carry around and easy to lose or forget, unless you just never unplug it, which is cumbersome
3. Many people who were born before the year 2005 (me included) have wired headphones that they prefer and have used for years that still work fine and have the sound quality and comfort that fit our needs.
4. Outside of the smart phone world, 3.5mm audio jacks are still very common and not obsolete
5. Bluetooth is cumbersome on many phones and headphones, introduces latency, and affects audio quality
I wouldn't buy a phone just because it had a headphone jack, but it's definitely a draw for me when a phone does (+ a removable battery or expandable storage, but HN is probably gonna tell me those things are obsolete as well).