I think a lot of people active on this forum don’t fall into that category - but maybe the majority of FP owners might still. But they probably won’t appear on this thread, then.
Personally, I work on a laptop which is now seven years old, and over time added the maximum amount of RAM, replaced the HDD against an SDD, and the battery. I also crunch numbers on it from time to time, but usually send harder tasks off to be parallelised on one of the workstations (with 16 cores and 96 GB of RAM). Suits me.
There are two reasons why I would replace my laptop - and I will also replace my Fairphone for analogue reasons:
a) I run a recent iteration of OS on my laptop. When I can’t run current software and a next-to-secure OS the laptop will have to be replaced. (Even today, my admin would probably not allow XP machines to be in our domain. I’m not going to find out.)
b) When I have to replace the battery again and can’t get one which suits me, the laptop also has reached it’s EOL. When I replaced original battery, I was really upset that I could not get a spare original for a decent price. So I bought a retail version and went down from the original 8+ to below four hours of working capacity, which was a bummer. Now, I can’t even get an original one any longer, since the manufacturer went on and is using a different kind of connector. Screw that.
When the same happens with my pocket computer, aka Fairphone, it will have to go. OS and battery are key components. Keep them replaceable, and the phone will last.