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by extrapickles 3101 days ago
The easiest way to get an IP rating is to use lots of glue.

If they went the o-ring route, it would take up more volume and would probably require replacement when the phone was opened as damage from dirt/age will make reusing the o-ring hard. Even worse is that resuse isn’t obvious to a layperson as it could be IP69 with a new o-ring and IP67 with reused o-ring.