I’m skeptical of your example, Haman’s name and father is read twice a year in a sing song tune that everyone I know recognizes and can easily finish “Haman ben…” .
Now if you said they don’t know Yerachmiel’s father I’d believe you, though I don’t think that is indicative of people not learning very strongly; even though that too is mefurash in the passuk
I don’ t think learning and preparing for a chidon haTananch are the same (though to be clear I do think there is value in knowing who Yerachmiel (which one’s?) father was) .