I don't need to be careless or have any real danger of dropping my phone in water to worry about water protection; humidity, sweat, rain, accidental splashes from a sink, spilled drinks, children, etc. are all very real often unpredictable water risks I might have very little opportunity to realistically avoid. I've seen those water detection stickers indicate water on devices that I know for a fact have been babied and never dunked for even a moment. Often humidity and a sweaty pocket were the only likely culprit.