This triggers a much bigger question for me - why does nothing happen to these authors based on this feedback? I don't mean "oh you missed a meeting or withdrew

This triggers a much bigger question for me - why does nothing happen to these authors based on this feedback? I don't mean "oh you missed a meeting or withdrew your paper so you get fired" by any means, but why isn't there a way for academic committees or employers to look up PhDs and see "oh interesting this person has a history of submitting solo-authored papers then being completely unable to answer all but the most high-level questions about it." Short of just the general "vibes" type of reputation that follows someone around this type of behavior seems pretty low risk, which is a large part of why people engage in it. Perhaps the risk should increase a couple orders of magnitude to stop it from happening.