A couple hours before I was on the edge of getting a Fairphone 5 but I read the specifications and didn't see 3.5 mm audio jack anywhere. So I thought to myself...why? The community has been requesting this for a couple years ago now so why not. They're already making money on the phone, they're really pushing for people to get their wireless headphones? Just add the headphone jack, shouldn't be too hard.
They said they're treating their workers fairly, sourcing from ethical sources, renewable claims, repairability claims, and supporting foss projects (they donated a fp4 to CalyxOS to support development). All of these are amazing, so adding a little headphone jack shouldn't be that hard in the grand scheme of all this.
*Add the headphone jack and I'll be happy to support and get a fp5.
Headphone jacks are not little. They take up a huge amount of board space on a device that people want to be small and light. They're also fragile and they open up a big hole for crud to get in.
Every one of your points have been a solved problem for a while. We had small, light, durable, and even waterproof connectors before Apple called removing them "courage" (it was to sell more wireless headphones), and people with monetary incentives started to remove them, too.
I've never had a headphone jack break and I've used the jacks on some of my devices almost daily for 10+ years.
I have had to replace several USB jacks in that time span though.
I think the biggest argument against headphone jack taking up space is the existence of the Samsung Ultra with the Spen. Samsung has an excuse for the Ultra not having a headphone jack with the space dedicated to the Spen. But, most phones don't have a built in stylus, so what's the excuse for them. Not like phones have gotten tinier. How is the spen a technological possibility, but headphone is being made to be some technological difficultly that is more difficult to overcome?
Because they can remove a small 10 cent component and sell you disposable 200€ headphones wich will be e-waste in 2 years, just look at how many more features the note 9 and 8 have compared to the s23 ultra, while the latter costs double