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Ifixit gives fairphone 5 a 10/10 on repairability and maintanence
(www.ifixit.com)
This is a most excellent place for technology news and articles.
I don't intend on turning this into some sort of fight but to me your comment has big
"I don't see the problem why can't other people just have enough money"
vibes (Also I checked and an adapter costs me 12$ on Amazon). I don't think you intended it this way, so I'll shut up now.
As to my actual answer:
I could go on, but there's honestly no point. We're different people with different uses for our phones/headphones. I won't buy a phone without a headphone jack as long as I still have wired headphones.
Adapters are literally <5 USD including shipping on AliExpress. At that point it's not about the price if you're buying a phone anyways, because the cheap phones haven't abandoned the aux jack.
Also the digital usb adapters should work on any phone (and computer), unlike the "dumb" ones that trigger the DAC inside the phone (if there is one).