Earlier quoted context omitted.
1. Many USB-C jack adapters are poor quality. 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 wo…
The fact of the matter is that phones that still have headphone jacks don't sell that well. There's always something else that demanders of that feature find wrong with them. You can list things as much as you want, but the market shows that almost noone puts their money where their mouth is once a phone with a jack is launched.
This likely has more to do with the fact that the only phones that have headphone jacks are low-end "cheap" phones with worse specs everywhere else. If the new Galaxy came out with a headphone jeack, I don't think their sales would suddenly tank.