The assertion here is that the effect of these signals on the chances of success are not very large and in fact the systemic prejudices they create against othe

The assertion here is that the effect of these signals on the chances of success are not very large and in fact the systemic prejudices they create against otherwise qualified pool of candidates, and the pressure they create for people to obtain these (arguably meaningless) credentials has a worse overall effect on the labor pool. So these signals wouldn’t really help you make better bets, and they have bad side effects, which is why we need to bin them.