Funny coincidence: Fairphone has a blog post titled exactly that. And they say the same thing on their shop page. You're going to replace your phone eventually, but Fairphone is the only phone company I know trying to stretch that out.

This is true. When the original Fairphone came out I didn't get it because I had a working HTC. My next phone was purchased as an emergency when my current phone fell into water, so I had to walk into a phone shop and buy an immediate replacement. But that was the day that I decided to buy the Fairphone 3... Because the phone that fell into water was sealed and glued together, and there was no way to remove the battery or dry it out. It buzzed and beeped to death in my hand taking all of my data with it (internal memory only).

I've been rocking the FP3 since then. Upgraded the camera, replaced the battery twice, and once replaced the lower assembly because the usb3 port got damaged and couldn't hold the cable.

My wife has the same phone now. So I could upgrade to the FP4 and use my FP3 for parts, in case she ever breaks a screen or needs a battery. But why bother? This works just fine.