People who build the vast majority of phones believe thicker hurt sales. And they do lots of market research. I'm pretty sure their market researchers aren't t

People who build the vast majority of phones believe thicker hurt sales. And they do lots of market research. I'm pretty sure their market researchers aren't telling them customers want thicker with longer battery life and the phone makers are just responding "oh no they don't!" Even if all the phone makers in the world ignored customer's wishes, it would only take one company to listen to market research and suddenly dominate the market to change everything.