They don't tell you if you "pass" or "fail" anything. They just kinda take the written and walk away. As far as "not wasting the sim if they don't like you"...come on now. At the interview, you go through the sim BEFORE the face-to-face. They would have no idea if they "liked you or not" cuz they haven't even TALKED to you yet. Although I am surprised they didn't make you do it being a CFI. When I interviewed, only prior 121 guys didn't have to do the sim.