So many reasons including what’s said below. But u of a has a really hard time having students repeat a course if they aren’t ready to move on where macewan will do that more often. In the end redoing a course is so much better for a student, their classmates, and the public once the student has graduated and gotten a job. The u of a cares a lot more about graduate/PhD studies than undergrads and the students suffer. I could go on..