The thing that this person seems to have either forgotten, or not understood in the first place, is that homework, and your education in general, is not for the teacher, it's for you. If you choose to cheat your way through you will gain less than if you actually put the work in yourself. This gets more important the further through education you go.
Probably the best outcome for an essay question is if you discuss it with your friends, all share your understanding of the subject, then write it up individually, incorporating anything new you learned from your discussions.
This does come with the issue that those who cheat could end up getting good grades if there is no 'live' check of their understanding, either through closed book exams, class tests, group discussions, or similar.