They (Samsung, Apple, etc.) should never have been allowed to glue it behind the screen. Threaded fasteners and a silicone gasket cover is good enough for 99.999% of the public use-case.

   > is good enough for 99.999% of the public use-case
You know this how, exactly?

Via firsthand observation of people in the world. Go ahead and check the number of people on the street that need the edge case of using the phone under IEC standard 60529. Now go ahead and check out how many people on the street want to be able to replace their battery.