I suppose it's a testament to their success, but, I have a fairphone 3 from almost 6 years now, and I'm a bit annoyed that they're basically "sunsetting it" (no more software updates, no more spare parts.)

My fairphone 2 had lasted 5 years, but was completely unusable at the end. My current phone works very well (again, huge kudos to the team if anyone is reading this), and I would not mind trying to reach the decade with it - but in a few months, someone (my bank, a shop, a 2FA, whatever) will ask for an unsupported android feature.

I know people will give me names of exotic non-android distros, but will they run my bank's app :/ ?

I had a similar experience but with the Fairphone 2. I never swapped out any parts because performance hardware upgrades never became available and it was superseded by the Fairphone 3. I've not invested again in a Fairphone since. I've no interest in paying extra for repairability I'm never going to use since they have the same obsolescence/replacement model as any other phone.

My previous phone was an OPPO Find X3 Pro phone. Incredible phone. I only changed it because it has no zoom on the cameras. But I used it for 5 years.

OTOH my OnePlus 5T is more than 9 year old now, and still perfectly usable (I changed the battery once).