As an ombudsman, the commissioner conducts investigations. If you put that question to Ontario commissioner François Boileau or former federal commissioner Graham Fraser, both of whom conducted many investigations, they'll tell you that every investigation is different, so they need a certain amount of leeway in order to adapt accordingly. That means that this discretionary power should be maintained, but at the same time, you should be educating commissioners on the importance of the powers they have, to encourage them to make use of them.
On February 28th, 2019. See this statement in context.