Hi,
I'd like to comment on the Fairphone 5 which I could test recently.
It is definetly different than many other phones, you can switch between 60 an 90Mhz refresh rate manually and you can manually (!) enable DC dimming.
The first day I used I coulduse it for 2-3 hours without issues but after a short while symptoms came back.
I haven't tested all possible combinations of display setting yet.
Unfortunately besides the sustainability thing it is not a very nice phone: Quite Slow, connection problems, camera ok, battery not.
But woth trying it
regards
/stede