Phones are already way slimmer than they should be. Now we have top-heavy "slim" phones with huge bulges for cameras*, 50% less battery life, reduced performance because of thermal issues, glued together in favor of screws and rubber seals, wasting weight and space on additional strengthening and internal routing.

Just because people think it looks neater than the more practical alternative.

The S2 had an amazing form factor - also with a small bulge, but at the bottom. It's a thousand times nicer to hold and carry than pretty much anything that came after. The S5 was fine too (waterproof AND you could pop open the back to swap the battery, if you can believe it!)

It's silly how much more ergonomic phones feel that don't have to compensate for an extra half millimeter.

* Many phones had this, but it's getting really bad now. Older phones typically also had the lens recessed to protect it, with a slim border around it. No more space for that now.