I don't see why the Steelers should change their defensive philosophy just because they are having an uncharacteristic year on defense.
If a team is going to play a basic defense, it has to have top tier talent all around in order to be a decent defense. With all the rules favoring the offense, a basic defense with average talent won't stop an average NFL offense.
Who exactly would you have signed that left after 4 years? How has this hurt the Steelers?
Playing Fantasy Football does not qualify you to be the in the front office or on the coaching staff of the Pittsburgh Steelers. They are professionals and you are not!