Great point!I've never understood the people who complain about the fact that Apple doesn't choose to make their phones thicker so they can have larger batteries. Anyone can add thickness/larger batter to an iPhone with an optional charging case. No one can choose to make an iPhone thinner and thus accept a lower batter life.
By Apple making their iPhones as thin as they do, the company leaves everyone with a choice. If you want a thicker iPhone/longer battery, you can do that with ANY iPhone Apple makes. The choice is up to you.