*walks into room.
*random die appears
*"Perception check failed"
Great, now I know there's a trap right there. I am getting the exact same outcome of failing the check that I would have from passing the check.
*in conversation
*npc talking
*"Perception check failed" appears on screen.
*Oh, so this npc just pulled some slight of hand on me. I now know they either pickpocketed or played some kinda trick, even though I'm not supposed to know. In this example I don't get the exact same effect as passing the check, but the main difference between passing and failing is supposed to be noticing vs not noticing that something happened, and I've noticed both ways.