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by morecoffee 3237 days ago
Not justifying, but waterproofing a phone is very hard if it has holes in it.
2 comments

Microphone, speakers, charging port - lots of holes. The Sony Walkman Sport from back in the day was waterproof, it had a standard jack
The audio jack is not a hole at all. It is a sealed port with metal plates inside. (Unless you make one for cheapening purposes.)
Perhaps, but Samsung has it figured out.