This is a neat idea, but basically puts very high stakes on fewer assessments, and these assessments differ per student. So they will naturally vary in difficul

This is a neat idea, but basically puts very high stakes on fewer assessments, and these assessments differ per student. So they will naturally vary in difficulty, and depend a lot more on the instructor, introducing more subjectivity into the process. I could imagine many serious issues of fairness "I got an impossible problem" and "who is the easy professor" in these cases.