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I'm seeing a lot of people with burn-in on 14 and 15 Pro's.
Definitely those people used the brightness level cranked up at maximum for the whole time, w/o using the auto-adjust feature and subsequentally w/o calibrating the min and max levels.
 
To give a bit of life to the topic.

I bought base iPhone 16 for my mother. Usually suppliers are BOE and Samsung. 16+ is just Samsung. Her unit came with BOE screen (Serial starts with GR9H). It's kinda yellow-ish and at max brightness feels like 60-70% of my 16 Pro. Uniformity wise is not bad.
 
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