You believe that a student that derives a proof from scratch is less knowledgeable than a student that rote memorizes it out of a textbook?
My argument comes from the perspective of the real world. It is, in effect, the same type of argument that drives the "interview questions on a whiteboard" discussion -- which qualities are actually important in an employee? As someone involved with hiring for a company that consistently produces high quality, critical code used in important systems, my experience is that "working under pressure" is pretty far down the list of important qualities.
My argument comes from the perspective of the real world. It is, in effect, the same type of argument that drives the "interview questions on a whiteboard" discussion -- which qualities are actually important in an employee? As someone involved with hiring for a company that consistently produces high quality, critical code used in important systems, my experience is that "working under pressure" is pretty far down the list of important qualities.