I have no objection to your example, but it is a very different case; it is convincing vs forcing. In your example the teacher is arguing to convince you, the

I have no objection to your example, but it is a very different case; it is convincing vs forcing. In your example the teacher is arguing to convince you, the final decision maker, that something is long term worthwhile even if near term unpleasant (and most adults who sign up for a class will usually listen to the teacher). The original example is closer to the teacher locking the door and saying "you will not leave until you show me that you learned X". Which is a very different setup that, even if fruitful, few adults will find palatable. My 2c.