I know this is a little OT, but I repaired a dead Karcher pressure washer this weekend... a little effort and I'm much more likely to purchase / recommend them in the future.
If the manufacturer's grip is too tight, I'm going elsewhere - and I'll be more loyal to them
Just to chip in, whilst I agree that Fairphone is not a truely interchangable modular phone, it does have the ability for some modules to be replaced.
The Fairphone 3 even had the ability to upgrade with better ones to create the 3+
I don't think the newer models are doing that though, which is a shame