I believe the counterargument here is that we've gotten used to phones being relatively thin, and people have learned to charge their phones every night anyway. Something about stated vs. true desires, just like with the Minis where people said they wanted smaller phones but then nobody bought them. I believe it might be a similar thing where people say they want thicker phones with big batteries but they won't actually buy them when they realize they will be noticeably thicker and heavier.