I’m surprised it’s taken so long for this “gem” to surface once again. I could also argue that if you can tell the difference then you are seeing things and require an immediate visit to an ophthalmologist. But that’s just as daft.
As part of my job I have to identify tiny features on plants and fungi. I know that there’s nothing wrong with my eyesight and I’m trained to noticed tiny differences. Believe it or not it’s a skill. Now, during normal use I can barely notice any difference. Sure, if I put the phone right up to my eye, or compare side by side, then yes, there are small differences. But I do not use my phone this way and personally I have better things to do with my life.
This is a side issue but I find all OLED screens oversaturated. To me photographs look unnatural. Worse on the cheaper displays but still noticeable on the iPhone. It’s as if you are in Teletubbyland. If you can’t see it then you need to visit an ophthalmologist

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Maybe it’s because some people enjoy paying Apple more for it?