Now that we have 4 unique thrall breaking devices, I think the taskmaster needs to be revisited. Instead of a crafting thrall, I would say it needs to be a placeable thrall (like a dancer) that provides an aura of thrall breaking increases for the WoP/gibbets out there. Limit it to 1 taskmaster can provide expedient breaking for 8 different thralls being processed.
So that not only does it equate the function, it also removes the cheese of just adding a taskmaster at the last minute to complete the thrall.