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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.
For me it's the micro SD card. Which the FP5 has... but I use my phone for emulators, and their phones aren't as powerful as I would need. Also, they don't sell in the US, so I couldn't use it even if I wanted.