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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.
There are plenty of products out there that use TS style audio plugs (more 2.5mm in my experience than 3.5mm) for DC power for portable devices. When you get to data transfer requirements, the higher pin counts of current connectors wouldn't be space efficient.