That makes it even crazier to me. Wouldn't it be better to not have a bump? The bump on my 6S always makes me nervous when laying it down. I would feel much better about it if it were completely flat rather than the camera of all things sticking out and being the major point of contact with the surface it's on.

I'd argue that an extra 1mm to thickness wouldn't affect feel of the phone either - especially since a good portion just slap cases on them anyways.

Seems like a pretty accurate estimation, to me. The phone itself is 7.3mm thick, which means the case would be at least 1+mm on each side. Let's be generous and say the battery's 3mm thick now. Adding another 1mm would be a 33% capacity improvement.