are willing to give up 10-15 yard completions but don't want to give up the deep ball. But in doing this after 3-5 plays your within range of scoring.

Same with the NFL. Mahomes have a minute 20 left on the clock. No problem to go 80 yards and score. Why doesn't the defense just play their normal game and not give up the small chuck plays.

BYU couldn't move the ball when Utah was blitzing each play. They stop blitzing and go to a prevent defense and BYU wins the game. Why use a prevent defense???