Yep, exactly. Chesterton's fence is a worthwhile thought experiment, but a lot of things that get justified with "we do it this way because it's been done this

Yep, exactly. Chesterton's fence is a worthwhile thought experiment, but a lot of things that get justified with "we do it this way because it's been done this way" are known to cause harm. The bigger problem is that this change is really stinking hard. In addition to whatever subject material you're trying to teach, you also have to re-train your students, because they're going to default to "an A- is a 93%, a B- is an 84%, etc", and somehow "things graded with more points were graded with more care"