When you are hydroplaning your tires are more-or-less floating on top of the water. They are not touching the pavement in any substantial way for them to be able to decelerate you. So even lightly touching the breaks will just cause the tires to seize up same as stomping on them.
You keep the breaks off so that when the car slows down enough naturally your tires will grab the pavement and start turning. This will allow you to regain control of the car faster.
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