IP65 does not protect electronics from water. It is a rating of the enclosure, which means that the device is protected from water.
How this protection is accomplished is not the issue. IP65 simply means that the protection is there.
Think of it this way: say you are guaranteed that your hair will stay dry in the rain. It could be done by an umbrella or a hat. IP65 simply is a rating that your hair stays dry.
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