I've said this before and I'll say it again. Everyone who thinks that this discipline has no benefit please read this.
One poster already mentioned that the O line goes on the designed call for the play. If you watch our offense. We do a lot of dummy calls, which are designed to get the defense to either jump off or show their blitz/coverages. When the QB is ready to make the real call, he then signals the left guard who relays the message to the center and rest of the line. And if we are in our fastest speed we line up and go.
So if someone jumps offside, it is the centers judgement to determine if and catch the defender off. Because the oline has not gotten the "go ahead" from the left guard, they are not set and therefore they stay still. The benefit of this is that because only one defender caused the penalty, and no offensive linemen are moving, the rest of the defense might not react or play a full defensive play. This could leave any of our 3-4 eligible receivers wide open. It is not the o lines fault that Peterman ran to the right and waited too long to throw the ball. He is taught to take a 2-3 step drop taking a quick scan of the defense and throw up top to the best option. In effect the play on the outside is almost the exact same as it would be of our line still tried to block as WRs and CBs all watch the snap. The only difference is that we may gain a half step or more on the defender as he sees the offense strangely standing still, which at this level gives us a huge advantage to make a big play.