Answer
One punts the ball at launch angles greater than 45° for tactical reasons. The kick doesn’t go as far, but has a longer hang time, giving the kicker’s teammates time to run down the field and "greet" the player on the other team who catches the punted ball, minimizing the distance that he can return the ball.
Professional American football punters can regularly punt the ball over 75 yards (https://www.youtube.com/watch?v=I9_2UMWQuC0) in practice, but generally do not punt so far in a game.
