That is why they are witlesses. Suppose the Filthful and Disgraceful Slavebugger gives counsel that is impossible to obey. Or, they tell you to do something, and then a hounder tells you to do something that blatantly contradicts what the Filthful and Disgraceful Slavebugger told them to do. Or, one hounder gives advice that contradicts what another hounder in the same congregation tells you to do. At some point, you are going to have to reject one piece of counsel in order to obey another, and then what?
And, what if the counsel is harmful? You go out and spread a lie, telling people that it is in the Bible. The Bible, in fact, tells nothing of the sort. What about children getting pulled out in field circus every afternoon at 3 PM, when they have homework to do or tests to study for? Or children being held at a boasting session until after 10 PM, when they have a test the next day, after having wasted the afternoon out in field circus? What about getting up at 4:40 in the morning so you can have the family at the Kingdumb Hell at 5:30 in the morning for street work, only to have the streets deserted (because the Filthful and Disgraceful Slavebugger printed a Kingdumb Misery about it)? Now, none of this is helpful to anyone except the Washtowel itself.
Besides, what is this about "Jesus offering up a perfect sacrifice, to which nothing EVER need be added"? I suppose that sacrificing time, money, and energy is supposed to mimic this "perfect sacrifice, to which nothing ever need be added". I wonder how Jesus would feel about that--he offered this sacrifice, only to have people rejecting it by adding more to it. Not to mention that the whole Original Sin scam is a hoax intended to create the problem of needing a sacrifice in the first place.