there probably is no time for 100 students to each do that in a university mathematics lecture, but there are probably ways to make sure students are still learning by restructuring the university into mandatory recitation and labs or something
Having two random people picked each time might cause all of them to at least pay attention.
I’m wondering if this is the way, but more faculty time is needed for assessing. So education costs go up.
They said “one person at the start of class”?
there aren't 100 university lectures a semester, so there is a small chance you are picked. meaning, good odds to not give a shit or good incentive to not go to lecture if you are behind. also, wasting 100 students' time to watch someone struggle through one gotcha, is more of a punishment for everyone, not something to make students learn.