Just use/buy an "old" phone with a jack? It is easy to find used phones (2021 or earlier) with headphone jacks. I have a 2017 phone and plan to upgrade to a 2020 phone.
It makes very little sense to buy a network-connected device which can’t be updated. And if you say “put Linux on it” it could be argued that you don’t know what tools like phones are for.
TLDR: you get a pocket laptop instead of a phone, despite owning a "phone"
Yes, exactly, thank you. You get a project that never ends instead of a useful tool. Maybe that’s what you want, and that’s fine if so, but that’s not what I want.
I mean, all the power to you if you use it as a daily driver, but I also own one and it’s just a toy, it is so slow.
I always felt that we basically "lost" with open source: Intel did the Management Engine and phones stuck everything in the baseband.
There's no real possibility of having fully software-hackable hardware. Someone else ultimately has control of all hardware, if they want to exercise that control.