I reckon you could make a pretty good argument that, to be fit-for-purpose, given where they are, they absolutely _should_ be waterproof (and that there's an implied warranty that the _are_ waterproof, or even _beverage_ proof).
But that just means you've got rights, not waterproof switches...
A splash of water is a completely different deal than a splash of milky coffee.
I know my koleos has had a bit of milky coffee spilled on its main data entry console. and apart from feeling a bit gummy as you'd expect, it still operates fine. It would be conservative to say it has only happed once.
If it was just plain water that spilled, I'd be very surprised if it made much difference to the switch's electrical or physical operation.
They are not tightening up on anything soft drinks are the killer of switches and circuits I would be more worried about the airbag and yaw sensor that lives under that console. I’ve done a heap of them on all sorts of brands no warranty would cover that.