Who do you want designing the brakes on your car (or the
flight control avionics on the 7\d7 you're getting on,
or . . .)? The guy that cribs the answer from the copy
of last years class notes and doesn't understand why that's
the correct answer, or the one that takes the time to
derive the correct answer himself from his understanding
of the underlying principles involved?
Sure your hypothetical fourth student got the right answer
easily, but they're not always going to be able to call
mommie for the answer (or she may not be as good an expert on
real time systems design as she is at cooking).