I think the thing that is driving thin phones with big camera bulges are phone designers now factoring in bulky phone cases when thinking about how the phone feels in a pocket. Overwhelmingly phones live in a case and that case becomes the phone in our head - a fat phone is apparently uncomfortable or displeasing somehow so a thin phone means a thinner case which equates to a better overall experience as the phone owner. It will fit in pockets easier, slide into car accessory holders instead of cup holders, allow a phone wallet combo to not be a pocket wad, and overall usability becomes easier for folks with weaker grip strength like older and younger users. There is a lot driving the move to a thinner phone but it does make the underlying device look really goofy.