[porknubbins]

I’d bet the reason is that very few people think strategically like that. Also how many hiring managers are really incentivized to improve the company interview process as a whole? Even very smart people rely on feelings like “this person seems likeable, confidant, knowledeagble etc” so if an interviewee fails at those things the it could be genuinely well intentioned honest advice from the interviewees’ perspective to get more polish in those areas. When faced with a real person trying their best it seems kind of mildly sociopathic to be like “no you fail and we won’t say why because that would dilute our hiring signal” (which does happen btw as I’ve received that treatment).

Or to look at it another way many people (like me) are naturally bad at putting their best foot forward even though they would be good employees so improving their ability to convey thay they would be a good employee is a win all around.