If we accept your "unreliable worker" theory, have you considered that there are outside factors besides a lack of "work ethic" (which is some real quality bs to begin with) that would make a person unreliable? If you have, what were they and why were they ruled out?

I find that people that make the work ethic argument are the ones that don't want to acknowledge that they didn't exactly earn their place. They think they rose to their position purely by their own work ethic and that makes them intrinsically special and possessing traits that others are deficient in.