I like repairable hardware and own a Framework laptop. It has a headphone socket that I use every day. If Framework made a phone I might be interested. If most fairphones end up paired to disposable wireless earbuds with limited battery life that end in landfill I don't get how that is more sustainable than adding a socket for the declining but still sizeable number of people who cling to wired stuff that just works.
My rugged mid-range Nokia refuses to take damage. The thing is cursed. I have dropped it so many times it is ridiculous. It might be years before I replace it. Has a jack as well. Made me totally re-evaluate what I value in a phone. I realized I am not a feature/performance fetishist. I want solidly made gear that has regular updates.