This is a huge generalization. Close to half of Americans have iPhones, and most because you know, it has iMessage and their friends have iMessage, or you know, because iPhones are vastly more secure and have vastly better support than their competitors, or because they're meant to be simple/easy to use, etc.
To say half of Americans are finicky and love aesthetics because there's no other reason anyone would buy one is a bit of a stretch.
(I'm probably buying an iPhone this year for the first time ever, and I don't really care how it looks, or how good it's photos are, and I'm definitely putting a case on it.)