> Why can't smartphone manufacturers understand that a longer battery life is whats lacking in mobile devices?
I think it's quite bold to speak in such factual terms when talking about the "average" consumer or the market. Your opinion does not necessarily apply to everyone, or even the majority of the users. Not that I disagree with you, mind.
It seems to me that these manufacturers are a lot better at knowing what their market wants. I'm saying that because these companies employ a lot of people to figure out what people want to buy. You might be tempted to project your own opinion and common sense onto how the market should behave, but I think these companies are doing a better job at figuring it out. They have to.
I don't think these companies are either stupid or not listening. It really seems to be the case that a large screen increases sales, and longer battery life doesn't. That might seem mystifying to you and me, but that really seems to be the case.
Similarily, you can make phones from plastic, with confusing and slow software on it, sell them for premium price, and own 80% of the Android market in many countries. That is also mystifying to me, but that's what Samsung has accomplished.
EDIT: People are replying to my post as if I said that phones with large screens are a good thing. I didn't.