I would in general recommend against getting a Fairphone. They traditionally have a lot of hardware issues. Some of the early issues on the FP6 (fried logic board while charging and broken volume button) are not user replaceable. Many people have had to wait a month before they get a reply from customer support and even longer to get their hardware fixed. They also completely fail to communicate about issues.

They also have a bad reputation when it comes to updating their software. E.g. their initial Android 15 builds for FP4 had bad memory management issues, with a result that many people could only have one app in memory at the time, which made it impossible to switch between e.g. an app/browser and a password manager/payment app. Some of their updates would cause boot loops when there were fingerprint reader issues, etc. Currently a lot of users are dealing with an issue where apps hang when used over WiFi because IPv6 gets misconfigured when a router sends an IPv6 router advertisement with lifetime 0 (which e.g. Fritz!Boxes that are popular in Europe do). The issue has been there for over three months without any acknowledgement or fix from Fairphone.

Also, even though they do Android Security Bulletins and major releases (though very late), their phones often run ancient kernels and firmware with many known vulnerabilities. This is also the case if you run an alternative OS, because pretty much all of them use upstream trees. Also their firmware has Chinese TCL image processing blobs (might be a security/privacy issue for some people).

I think many of these issues stem from the fact that the development of both the hardware and the software is largely outsourced to a Chinese ODM (T2Mobile), who maintain everything, so there is a lot of delay in everything. My guess is that Fairphone as a company is mostly a PR/support/supply chain auditing (as in minerals/labor, not software supply chain) company, with all the development outsourced.