Agree with the point, but not the reason. In uni the consequences are way higher - failure in a subject means repeating and forking out another $1,000+ on the course. Moreover, some graduate programs cull all candidates with fails on their transcript. To me, uni was less intense because you have more of a life - you aren't consumed by school as you are in HS. My best semesters at uni were the ones where I had a lot going on non-uni related.