Is gluing the battery inside the case really a requirement for waterproofing? When they remove the battery cover -- "oh, waterproofing" When they glue the bat

Is gluing the battery inside the case really a requirement for waterproofing? When they remove the battery cover -- "oh, waterproofing" When they glue the battery amd remove all screws -- "oh, waterproofing" When they eventually require an approved persons blood sample to perform repair, will I also hear the "oh, waterproofing" thing?