One of my "favorite" examples of how people think about numbers, rules, decisions, etc... is when a state decides to put in a uniform grading scale, or change it. And so South Carolina switched from 93-85-77-70 to 90-80-70-60.
And then they act like changing that matters and the courses will become easier or harder based on how it was changed. Because apparently the teachers aren't smart enough to make the questions harder or easier to get whatever effect they want. (Similar things come up when a state decides a B average is needed for scholarships, for example.)
Does a rule involving numerical cut-offs and consequences do anything if the rest of the system still isn't constrained?