I agree, but how do you estimate their aptitude in an unbiased way? That mostly rules out face-to-face conversations, which is what most companies use.
Aptitude tests? I feel like those have a bad reputation, at least in Bay Area tech companies. Are there good tests we should be using? How do you customize the test to fit your own company? To the extent that "cultural fit" is important for effective teams (and isn't simply a way of excluding women, black people, etc) how do you test for that?