“The problem is that student performance is continuous.”
Round one 89.952% up to an A and the new line becomes 89.903%. Write a clear, short assignment and a few students will lawyer every ambiguous word. Nobody thanks a teacher for policing cheating, least of all the administration that has to do the paperwork. The rigid, hostile rules students hate are scar tissue. Every one was a reasonable teacher’s response to the worst student in the room.