SV is full of mediocre engineers; so it fails at guaranteeing you got yourself a star. And I don't think anyone needs more anecdotes to think great candidates lose for arbitrary/subjective/misunderstanding/random reasons
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I'm 15y into my career with a degree from CMU; I am treated like royalty everywhere I work ... and yet I still absolutely dread, hate and repeatedly have bad experiences interviewing for jobs.
I've considered switching careers numerous times because of the emotional distress I go through just interviewing. And that's before we even talk about the insane amount of time every prospective employer demands of you!