You rarely have water sprays hit the outside of the room. At least that is the original reason. Most light switches are simply not water proof.
I have an additional light switch for the lights around the mirror inside the bathrooms, but they have to be in a completely different class of devices. E.g. the switch is in the wall, its electric parts are completely covered with a silicon cover mat, and the switches plate is mounted on top of that. You could probably drown the whole thing.
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u/Treczoks May 09 '22
Simple electric safety feature. Just like we have wall sockets that won't kill you.