There is literally no way right now for any company to assess the false negative rate, i.e. how many well-qualified engineers they turned away. They can only a

There is literally no way right now for any company to assess the false negative rate, i.e. how many well-qualified engineers they turned away. They can only assess internally the false positive rate, i.e. how many engineers they thought were going to work out that did not. The fear of making a "bad" hire, is so pervasive that we optimize entirely to minimize the number of false positives, completely ignoring that making the interview more and more difficult is probably having a marginal effect on reducing the FPR but is drastically increasing the FNR.