Temple winds up forcing teams to take quick shots. That plays right into the Owls' hands because they will come down on offense and be patient, forcing you to guard them. Ultimately, if teams aren't careful, they could end up playing 70 percent of the game on defense. More teams would use the matchup zone if more coaches understood it. Coaches teach what they were brought up to understand.
Most zones play the ball.
Temple plays you. The Owls make opponents do what they want you to do. They don't react to the ball. They make teams react to them. Since a lot of coaches don't have any idea what Temple is doing, very few install the defense.