Why?
Having read Thinking Fast and Slow and been convinced by this book's many useful views, I would agree that a simple questionnaire-based ranking is actually better than any subjective assessment of candidates. And it should be as neutral as possible, ie not letting one's "first impression" influence the ranking (because it is almost always based on irrelevant physical features).
But even then, there is no reason for this neutral evaluation to become worthless if not 100% consistently applied. There is the broken leg case: If you want to evaluate the probability of someone going to see a movie tonight, you just base yourself on simple statistical facts (how frequently people go to the movie in this country), and should not try to infer more from subjective context, except if the guy in question broke his leg this morning.
These tests and evaluations help much in reducing system bias due to halo fallacy, framing effect, and even time of the day for the evaluator (it has been proven juges are more lenient after lunch!), but they still are only helpers, they do not need to be decision-blocking.
