Herding is a refined prey drive. Not all dogs can do it and some would rather case the livestock and not gather them. Here is the difference, the desire to gather and then hold. The drive can be so strong that some handlers can't control their dog! This is one reason I sold my sheep a few months ago, the cost verses the rewards.
It costs money to raise and keep sheep. When some handlers can't even control their dogs and in the drives the dog is showcasing, it takes the fun out of herding lessons and seeing K-9 growth. Drive capping could be one control technique that some could use to help wth their wild critters!