I have no idea why something so simple escaped my attention for so many years....
So a ways back I had posted how in a few select case, smartphone screens that had caused me pain were converted to pain free phones by adding a Skinomi screen protector. Problem is Skinomi doesn't make screen protectors for every phone.
So I was going through my annual routine of buying 20 phones, and returning them all after they all cause me pain, and looking at screen protectors. I know most today are glass (which have never helped), and I know there were PET film screen protectors. I don't know why this was the first time I was inclined to Google "What are the different kinds of screen protectors?" in the last 10 or so years, but I did and I learned about TPU Screen protectors. Which seem to be what Skinomi's are. So on a whim I ordered a knock off TPU screen protector for a phone I was trying (Skinomi did not make one for this device), and lo and behold, it did help a bit. I wouldn't say it was 100% out of the gate, but after a few days it may become useable.
So just an idea, if a phone screen is causing you issues, see if a TPU screen protector is available for it. Maybe it will help.