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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 have just recently bought a FP5 as well and I wouldn't trust myself without it. Without a case it's pretty slippery. And just because it's easy to repair the screen doesn't mean I risk it getting broken more than necessary. So the 34 Euro I paid definitely was worth it. Especially considering it's made out of recycled material.
I feared that the fingerprint reader would be hard to reach with it, but luckily it works pretty well. A slight touch is enough to unlock it.
That's why i put on a screen protector. It protects the screen, realistically the only external part that matters, and doesn't really bulk the phone.