Exactly. Even if in-game doesn't want to show exact scores, it can at least do a binary clear/no clear as a DF requirement. People would be a lot more likely to test their luck in harder content with randoms if there was at least a guarantee that said randoms could, at a minimum, pull their own weight.
Having the system be the one to tell a player that they are not ready yet leads to a hell of a lot LESS judgement and harassment than having the player join anyway and get called out after failing and wasting people's time.