There's no one to hold companies accountable for having a unjustifiably high or low filter. And frankly I don't think anyone outside of CS has gotten those filters right any more than CS has. An incorrect filter turns into "Well, there's no one qualified to work for us" or "Well, all of these candidates failed to do the job" which leads to incorrect assumptions about the labor pool, which is what's going to bias your hiring decisions.

There are companies out there hiring for A+ students that would be just as well off with a C or D average student because what the company is doing day-to-day is too far from what university was like.