I only use it to push unsuspecting gobbos of roofs tbh 😂
And imo guarranteed succes is fine. Someone cant suddenly brace if they dont know its coming. Even disadvantagr is to much imo as the dice could still fuck you over. Same for say... slicing someones throst whos asleep. You literally cant fuck that up. No roll required.
Think there was even a rule that if you realisticly cant fail at something because the act is so mundane for you then no roll is required. But it could come from a different pnp rpg.