The charging port wore out. I bought another one in 2023. They still sell that part today. https://shop.fairphone.com/shop/fairphone-3-bottom-module-37
In fact, I see they still sell parts (the screen, at least) for the Fairphone 2, released in 2015. First-party parts 10 years later, what a concept! https://shop.fairphone.com/spare-parts
I don't know your friend's scenario, but this was mine.
It's not an either-or, like "either buy first-party parts for a Fairphone OR buy a second-hand Samsung". You can buy a second-hand Fairphone too. It would be nice if you got first-party parts for Samsungs, years after they're released.