I suspect that Apple is combining the two. Remember the "Megahertz myth" form the 1980's? I think Apple knows better than to brag about MP on a camera. I find that the improved camera is the main reason I jump on every new iPhone.
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The cameras are great. As they say, "the best camera is the one you have with you"
Agreed
Megapixels do matter and will provide a better quality picture provided the sensor improves as well.
When most people discuss megapixels they are ignorant to the fact that you can get amazing photos without the 15/18/24/30 megapixels that are advertised. Megapixels matter when it comes to cropping and also how big you plan on printing. The majority of home users don't use their cameras (phone or otherwise) to shoot images they plan on printing billboards with. In fact, I would argue most of these photos are shared online - which 3.2 megapixels works just fine. More than fine.
The megapixel "myth" is akin to TV's contrast ratio.
It sure helps upgrade sales though.
I don't disagree with you (entirely). But when many people get excited about megapixels - they aren't getting excited about the right thing.