Thanks for proving my point. Like 5 people noticed it on previous iPads, compared to the majority of people noticing it on the mini 6. Do you have the mini 6? Go take it to a store that caries older iPads and compare it side by side. It is 10x more noticeable than any other iPad ever made.
I think you're exaggerating "majority". Even if it's a problem for like 10,000 people, chances are it's a non-issue for the rest of the millions of customers who bought the mini. Certainly could be more affected with the mini 6 compared to previous models but not enough to constitute a majority.
Mind, I think there's like the same 20 or so posters complaining about jelly roll here on MR.
I personally have a problem with OLED iPhones (causes migraines) but I'm sure hundreds of millions other customers are perfectly happy with theirs. My solution? Use the iPhone SE2.