You make this claim but have you ever worked in product design for something trying to achieve an IP water and dust ingress rating?
It is far more than "just a gasket and a few screws". The rating can't just be good on unboxing day. You want it to hold even after a few years, several drops on the floor, in cold weather, etc.
It is far more than "just a gasket and a few screws". The rating can't just be good on unboxing day. You want it to hold even after a few years, several drops on the floor, in cold weather, etc.