A repairable phone is the most important thing. I could buy a used flagship, but the battery will be trashed. I used to buy a phone every 2 years but now I just buy a battery every 2 years. I can use my phone knowing that if anything breaks I can have a replacement part in within a week, and I don't have to spend 100€s to ship it to some repair shop in a different part of the country.
Fairphone 4 and 5 are also the only smartphones certified by the Swedish unions: https://tcocertified.com/product-finder/index?category=Smartphones
No way.
These shops only service iPhones and Samsungs, there's only like 1-2 shops in Stockholm that repair Pixels and Xiaomis at all, let alone whatever 3 year old model you have. Not to mention things like screen and USB port repairs cost 100-200€ more than the fairphone parts.
I've had to wait a month for a fairphone battery before, but it's not like they're discontinued. I can imagine battery warehousing costs more than screens and USB ports.