So, you never played offensive line I gather? Say for example you are the left guard and you know that the center is pulling to his left on the play called. You have a defensive tackle in front of you and the defense brings a linebacker up over center. You, as the left guard, now have two people to block, so if you don't think that you are going to be quick on the count, your nuts. The left guard was not COACHED to jump offsides but, in the interest of saving his QB and running backs from a sack and loss of yards, he might, just might try to beat the snap by a split second. Heck, you see this on almost every play in the NFL nowadays where the tackles move backwards at or slightly ahead of the snap to thwart off defensive ends with lightning speed.
Good coaches, and there are a handful of them, anticipate what the D is going to do and therefore allows the O players to play within themselves.
More people on VN are coming to accept the fact that the offensive play calling is really hurting us. Just sayin'