Personally, I feel the slash bunt is useless if it's used more than occasionally. Then what you get is a lot of easy line drives to the third/first baseman who has learned not to charge very far. Far better that it be a total surprise. Honestly, at very young ages or even at, say, 12u at lower levels of ball. Not many batters can pull it off anyway.
But the butcher boy can be "gamed" by using it a couple of times, then dropping a bunt down third, then back to the butcher boy. I have seen that type of thing more than a couple of times, not an entire lineup... but the same 3-4 guys repeatedly throughout a game. Someone said this doesn't happen in higher level ball because the defenses are so good. No, this could be an effective offensive strategy against a Miguel Cabrerra type defender at a given level. The reason it doesn't go on is because, to complete the example, the Max Scherzer type player would plant the second guy who tried to pull that.