I can't agree with this viewpoint at all. If you take a viva of one of these students who came in with a pre-written answer sheet copied from a friend, a vast majority of them would straight up fail.

As TA and prof, I have seen cheaters copy word to word, spelling mistakes included, incorrect grammatical structures as is, basic mistakes like 6/2=2 untouched, because they are literally Ctrl-C Ctrl-V with their hands, with no brain involvement whatsoever.