I did ruin the water protection on mine pretty quickly though, because the back panel was made of plastic and was... flimsy. It basically became a fidget toy.
When thinking of how flagship phone producers are going to keep making sexy phones that also keep their watertightness, my biggest worry is repeated stress from any removable component becoming a fidget toy
I also replaced glued batteries in phones following ifixit instructions a few times (using a hair dryer/heat gun).
They didn't have any less or more "protection" than the replaceable ones. They looked exactly the same apart from the connectors ofc.
Please substantiate your claim. Until then I call it BS.