There are always people who have no problems. They're either extremely lucky, not so observant, or in the case of burn-in etc they don't use their phones enough to get it.
The number of people for whom perfection is the minimum standard is pretty small.
I can appreciate how a person of discernment, who is paying a lot of money for a product, is likely to be more demanding than the average Joe/Jane. However, I don't think it's "luck" that the vast majority of iPhone and iPad owners do not detect such "flaws." These may be expensive products (relatively speaking), but they're not built or sold for the connoisseur market ($100,000 home theater systems, $200/person restaurant meals, $500 bottles of wine, etc.). They are designed and built (and quality-controlled) to satisfy the vast majority of consumers - people who may not have had their senses honed to quite such elevated levels. So yeah, you can say, "not so observant," but if you do, please say it with charity.
Speaking as someone who has made his living with his ears and his eyes, discernment can be a curse. Is it magical when everything comes together (great source material, great artistic execution, great technical quality)? Of course. But if you can't be with the one you love, love the one you're with! The quality of an LCD display has to be a good bit worse than those used by Apple before it substantially detracts from my enjoyment of a good movie, or undermines my pride in the photos I'm showing off. When I made recordings and when I make photos, my first task is to make the work speak eloquently under even mediocre listening/viewing conditions. The rest is icing on the cake.