Oh, come on

The ability to write well co-evolves with having stuff that you want to say. Students don’t get to choose their topics or when to write: they are acting under coercion, and those few who are relatively motivated remain anxious about grades.

Hence student essays are boring, while students’ blogs are (often) interesting.

OFC, if authority figures started reading those blogs and assigning grades to blog entries then the blogs would disappear. If the blogs were subsequently required to re-appear with deadlines etc then they would quickly become boring, just like the essays.