This just shows how little you know about bits. The traditional bit used by the Vaqeros is called a spade bit. It is a pre signal bit used on finished bridle horses. Is it not use to train a horse and there is no pulling. The lightest movement of the reins will signal the horse and that along with the riders seat and legs cue the horse to do what is being asked. It is not about the bit but the training. You can not get this level of fenness or lightness in a snaffle. This is why a finished bridle horse is not in one but in a spade bit.