What's the difference?

I have recently filled out my subsequent application form for Waterloo and one of the questions was a) have you taken a course outside of regular day school and b) what was the purpose of taking it outside of day school.  In the last couple of weeks, it has become a habit of mine to read a blog written by a prof. at Waterloo who administers the subsequent application form process.  In it, he says they look down upon any student who takes a summer school course.  And I thought this would was completely unfair.  I know from my own experience, it was to lighten my load in my grade 12 year, so I could especially focus on the more math and science focused classes and to be able to take electives like the one currently in.  However, Waterloo believes that all of their applicants should be taking their classes during regular school hours because summer school is notoriously known for being easier.  This is very untrue.  My friends took summer school English in class.  Their teacher had a PhD in Literature and was an English prof. at Harvard for 10 years.  It is a very debatable topic one I find to be just as debatable as school uniforms vs. non school uniforms.  There are very good points for each side, but what I believe the university is judging unfairly is why they are down grading their applicants who take summer courses.  For students who receive a higher grade in summer school than what they would achieve from their own school offered course, should students who have tutors then not also be deducted who take school regular hours.  In both cases, the student is receiving a higher mark than they normally get in the regular school offered course.  This is what I find to be debatable so debatable I started a thread on reddit!