If it were something worth asking to figure out who is a good hire, maybe - however, it's viewed as irrelevant at most jobs, so why waste precious interviewing

If it were something worth asking to figure out who is a good hire, maybe - however, it's viewed as irrelevant at most jobs, so why waste precious interviewing time asking about irrelevant grades? It's a waste of time, and thus unreasonable thing to ask about, wasting a candidate's time and the interviewer's time in revealing how little the interviewer knows about effective interviewing.