Nah..defense will always matter. You just saw the Rays win the AL pennant in large part because of great defense.
Maybe some of the advances in the game make it less important than even 5 years ago but it’s still very important. Run prevention will always be important.
Its like people who watch the NFL and think the shiney toys are WR and RB are what win you games because the game is so offensive nowadays.
You still win football games at the line of scrimmage. It has always been that way and it always will be that way.