I disagree, Ralph. On a legal low block, the blocker will have likely made initial contact before the ball leaves the FBZ. The lineman are only a yard (or less) apart.
Sorry, bama, not even close. By the time the offense reacts to the snap, the ball is out of the zone. On a good snap, the ball leaves the zone in less than .25 second. There isn't an NFL linemen, let alone a HS kid, that can react to the snap and make below the waist contact with a player across from him in that .25 second, particularly from a 2 point stance.
In addition, the defensive linemen are expecting (or at least anticipating) such a block.
Not if we make them illegal in a shotgun formation!
I'm not for eliminating the FBZ. That would also mean that all contact from behind would be a foul, and that kind of contact is going to happen on run plays up the middle. And as much as I don't like low blocks, I wouldn't even vote to eliminate them on plays where the QB is under center.
But if an offense wants the advantage of getting the QB further from the line (for numerous reasons), then I'm all for taking away the advantage they get with low blocks. If you want one, you should give up the other.