You are perfectly right, my bad. I read one review on a news site, and i can see after checking displaymate that the dudes on the news page only compared the "peak brightness on portion of the screen", which i assume does not make sense in day to day usage, there the "full screen brightness" would make more sense.
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I think yes, as i was informed the peak brightness where samsung wins is only "portion" of the screen, so maybe Apple did indeed lower that peak brightness (as it also doesnt make sense to have a really bright part of the screen?) to prevent burnin. i think you are right about this, maybe apple was just smarter to have a upper limit on nits to prevent damage to the screen with long term use, but still keeping a nice bright full screen experience