It appears that Sony have changed their stance on their IP68 rated devices and their use under water. Previously the Sony Mobile page stated the IP68 rating made it possible to use the devices under water, the page now has a very carefully constructed description of the testing in laboratory conditions including the (multiple times over) mention that the testing is only conducted with fresh water, not bath water, not sea water etc.
Your device has an IP rating. This means that under a strictly controlled laboratory environment, the hardware works as designed even after being exposed to specific conditions.
Sony devices that are tested for their waterproof abilities are placed gently inside a container filled with tap water and lowered to a depth of 1.5 metres. After 30 minutes in the container, the device is gently taken out and its functions and features are tested.
Reading between the lines, Sony seem to be preparing the market for rejection of warranty claims based on water damage through devices and re-establishing the expectations of users from My device is waterproof to My device will survive if I spill a drink on it, then gently rinse it with fresh water.
Its an interesting change in attitude from the manufacturer and may lead to a shift in approach from others who offer water and dust proof devices.
Will an attitude shift regarding IP rated devices from manufacturers change your buying plans for your next device?