The point of purchasing from Apple - or at least one of the points - is that Apple could be "trusted" to do much of the research for you. If you went to an Apple store requesting the phone with the most bang per buck in display and camera functionality, the "genius" types would direct you to the appropriate hardware. If you have to do all the research yourself, then yes, get on Google and read extensive reviews of the top of the line phones available and choose accordingly.
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Hmm. To compare Apple to the generic "car dealer" is not quite the nuance you are looking for - car dealers range from low end used car salesmen to the high end dealers of Lamborghinis, Ferraris, and the like. I would tend to trust the high end folks a bit more than the used car dealers - the high end car dealer has a lot more to lose in terms of brand reputation if he/she makes an underhanded sale, and the customer has a lot more to lose moneywise. Apple has somewhat tainted its high end reputation the last few years. "Caveat emptor" is horning in a bit in customer land.
I don't see apples reputation being tarnished, but I guess to each their own.
With these days of instant on-line reviews, all car dealers can take a big hit in trust, not just high-end dealers. But how many Ferraris are sold vs Toyota Camry? Caveat emptor applies to anything you buy. Know what you are buying.
Apple cannot do your own research, determine how much memory, ssd, how many gig, what size, what model. You have to know what you are buying. By saying things like "apple can be trusted", which yes they can, but they can't crawl inside your brain and thus the blame-shifting.
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I can feel for the OP. Everyone here saying to do research, in under apple's own page has much info on this. Should amoerson really have to go to a third party page to buy something?
That said, there are easily accessible text units st Apple stores, Best Buy, carrier stores, etc. so while you may not intuitively find a spec sheet to compare, you can get the product in your hand pretty easily.
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Among people here, maybe. I present to you my mother who doesn't even have a concept of data. To her an email is the same as a picture is the same as a video. Some of the stories my wife tells me from Best Buy are excellent too. I think calling pixel density common knowledge has having far too much faith in consumers. People buy what they are told is better along with what fits into their budget.
Would your mother care about pixel density? Or to her would the overriding feature of a phone be comfortable to grip and easy to use. And if it's not the highest spec phone on the spec sheet, that would be okay?
When you buy a car, if you care about performance, do you take the sales persons word on it, or do you do your own research? Someone who claims to be a digital photographer in 2016, should care and know about pixels and densities and resolution and depth of field and all of that stuff, and this is just screen resolution, nothing to do with the final product.