I love the fact that we have a coach that can really coach. He is not a former player who coaches just because he has the respect of the players, he his a technician. His idea about defense is noteworthy because defense does a lot of positive things for a team.
First, it makes the opponent expend energy on offense, which in turn tires their legs so it takes away from their defense.
Second, good defense leads to turnovers and easy points on offense.
Finally, we have the personnel (young players) who can run teams tired by playing dogged defense.