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Any hiring process should focus on never letting in a bad fit. Even if that means accidentally rejecting a lot of people that would be good fits. Said another way, it optimizes for no false positives, even at the expense of false negatives.
The Google hiring process is notoriously long and complicated. Internally, it's kind of a Liberum veto thing - a single no-vote of the hiring committee means you're not in. Why? Because they put the principle of 'no false positives' to work. They assume that there is a huge talent pool of great people and that they can afford to pass on people that would be great fits in order to make sure they never let someone through who doesn't fit.