I think the department lacked what I would describe as a framework for dealing with this question of fraud in the student applications, from telling people what the rules are upfront to following up to promote voluntary compliance with something like departing the country when the visa's expired. It's practices and techniques like nudge.
I think the department hadn't thought through what interventions were required to make sure that students followed the rules and that they departed the country when their student visa expired. It's not always a removal straight to CBSA. There are a lot of things that ought to happen over the life cycle and the relationship between IRCC and the student to promote voluntary compliance with the laws of this country.