One of the core principles of the west coast offense that New York Giants offensive coordinator, Ben McAdoo runs is attacking the entire field. Before the west coast approach was developed, the passing game was simply to get big chunks of yards and therefore the passing game attacked the field vertically.
By spacing out receivers all over the width of the field and using short, intermediate and deep passes, the Giants offense forces the defense to cover the width of the field as well as the length of the field. Everything is about spacing and timing and the result is getting playmaking receivers in the open field with the football.