I'm basing this just on my own preference, but I'd bet I'm far from alone. In my humble opinion, the iPhone 4 was thin enough. Upgrading from the 3GS, with the rounded back, we went to the 4 and got a slim, flat backed device that weighed enough to feel substantial in your hand and noticeable in your pocket, where I really didn't have that "Crap, did I forget my phone" moment while walking away from my desk. I applaud them for finding ways to shrink the the existing components while adding new components, and managing to fit them in smaller and smaller spaces, AND still manage to reduce the weight. Please stop. Well, more specifically, please stop making the over all device thinner and lighter.....I would gladly trade these "Features" for more battery. As the components get smaller, and opening up space in the case, I'd much rather they fill the void with battery mass and improve the overall battery life. I know the new battery is a bit larger than in the 5s, but wouldn't it have been better to the overall customer experience to increase the battery life even just a smidge more? Since the 4, I have yet to be impressed with the weight of the device. However, I'm always disappointed that the battery couldn't have been substantially improved. I would happily....and enthusiastically trade in the lost bulk of the device with added battery mass. The lighter device doesn't feel as much like a quality device as it would with a little added weight. It feels......less substantial. I hope comes across more as a "Wish List" item and less like a complaint. I'm very happy with my new phone and appreciate the engineering that's gone into designing and manufacturing the device. I'm just hoping they will focus on utilizing any saved space, and weight, for additional battery mass.