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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.
Negotiation is a thing for sure. It is possible, though I haven't ever seen it implemented, that digital audio over USB-C or bluetooth can be blocked by DRM. It would seem business suicide to do something like limiting audio output to certain audio products but I wouldn't put it past any short term minded profit seeking enterprise.