Want to remember your e.g. hotel room number, parking garage floor/zone, or bus stop? Snap. Backup your plane ticket? Snap it. Record the wiring before an upgrade? Snap. To input your dietary nutrition later? Food picture. Part/model number? That's a picture. See behind something? Etc, etc.
The fact you only think smartphone cameras are for "bathroom selfies" (?) says more about you than whomever you're trying to disparage, because you're obviously under-utilizing an extremely valuable tool in your pocket because you've put it into a tiny box and dismissed it.