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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.
It's definitely more than the market is not large enough or willing to pay enough to make it worth while. A phone with 3 USB ports, a physical keyboard and a huge ass battery?
That's not a phone, that's a laptop. The amount of people willing to pay for that is going to be miniscule.