But you are assuming your filtering mechanism, in a short window of interviewing, si actually any better than the people that have worked with that person for many months, if not years! Haven't you ever recommended someone, just to see them not get hired for reasons that don't seem realistic? I have, it happens all the time. Companies are often selective, in the same way that asking a candidate to roll a D20 and only hiring them if they roll a 3 is selective.

If 4 people that work together and I want to hire happen to bring in a 5th person that did worse in my interviews, I don't worry about their judgement: I wonder about my interview process!