I'll never understand why "thin" is still a standout feature of a phone when they add a fat ugly camera bump on it anyway. Why not make a thicker phone and the camera flush with the casing?
Thin never works for me because I need a case anyway so I don't break it, so the added thickness takes away all the effort that went into making the phone thin. I'd really like a slightly thicker phone that doesn't need a case. I think overall this would allow for a better experience (for me at least) because it would be part of the design of the phone.
Flush means the whole thing lies flat on the table, a lump means an edge of it is on the table but the bit on the lens isn't. Recessed would fix that but adds even more size.
Camera glass in Samsung and Chinese phones simply crack from laying them repeatedly on a flat surface. With iPhones one at least has to be unlucky and hit the camera with some rock.
Weight. Phones are heavy nowadays as is, and you can’t just leave that extra volume with air. Making the batteries fill the space would make the phones too heavy to be comfortable to use for many people.
Camera bump is hardly a problem actually. Even fatness wasn't much of a problem for me when I tried the Z Fold 4. The problem was the lack of protective cases. These foldable phones are quite heavy and one drop means a lot of damage - only a well-fitting strong case can save them from breaking into a mess.
There were no suitable cases for the Z Fold 4 and other foldable phones (other than the one ugly Spigen case that adds one inch of extra width) that would allow me to enable good protection.
I use the official case for Z Fold 4 only because of the camera bump. The shape of the camera bump make it almost impossible to stay still on the table.
But I think Pixel Fold doesn't have the issue if I choose it. The shape can stay still on the table I think.
The reason for placing these cameras on the exterior is to allocate more space inside the phone for chips and electronic components which is more valuable than a flat phone with mediocre camera.
Thin, with camera bump, and with glassy slippery case. So many times I put a phone on a flattish surface, turn around, and hear the device falling on the ground...
The camera bump is actually the only thing that has ever made phones in pockets annoying to me because the camera bump gets snagged on other things in pockets
thin means smaller battery which is lightweight & as a dark pattern it will go through a full charge-discharge cycle. that means its lifecycle will be inherently shorter. so planned obsolescence & fits nicely with upgrade cycles.