Yeah, and drop your iPhone, in a ruggedized case, into 3 inches of bath water for 5 seconds from a height of one foot and then realize apple's IP68 claim is laughable.
This is also why almost none of the manufacturers will fix the device under warranty when there is water damage, despite the IP rating.
Even Apple themselvers recommend against submerging and iPhone in water:
To prevent liquid damage, avoid: [...] Intentionally submerging your iPhone in water
https://support.apple.com/en-us/108039
The water resistance in these phones exist so that the phone hopefully survives when they get wet accidentally (heavy rain, pool drop, etc.). Not to shower with the phone, cleaning it by putting it under the tap, or doing underwater photography. Usually, it survives, until the seals fail.
So accidentally dropping the phone in a bath or toilet for a few seconds doesnt count as that?
And of course high heat melts the glue (like hot tubs)