Actually, the S7 isn't really waterproof. http://fortune.com/2016/07/09/samsung-galaxy-s7-active-waterproof-consumer-reports/
So maybe for true waterproofness, the jack has to go.
First thing first, the s7 was advertised as water resistant. Not water proof. (Hence just tells you even the article you sent us to doesn't even know what it's talking. )
Next, it was just a batch of the s7 ACTIVE that has this problem. Even the s5 and the regular s7 and edge are doing their job at water resisting.
It's like a batch of iPhone 6+ that bend means all the iPhone 6+ will bend? Obviously bs?
And if you don't know, they don't even know where the water actually went into the phone itself. If the s5, s7 and the s7 edge have no problem with water resistance together with all the Sony phones, i think there's no reason for Apple to remove the headphone jack solely because it "helps" in water resisting.