It’s not necessarily the “most aerodynamic shape”. It’s more Just the shape water takes when falling. The water droplet isn’t actively trying to cut through the air most efficiently, like a pointy nosed rocket, aircraft, or sports car. Water is just reacting to the airflow around it as it falls.
Air pressure against the bottom (or forward edge) of the drop gives it the round shape. The air flowing around the drop gives it the pointy tail.
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