Trudeau also commented on the form of electoral reform:

He said one of his mistakes was leaving the door open to proportional representation when he did not plan to pursue it. The other, he said, was “not using my majority to bring in the model that I wanted”—the ranked ballot.
Trudeau said he believes a ranked ballot is the most effective at reducing polarization because it causes parties to moderate their message in an effort to pitch to be the second choice of supporters of other parties.
However, the system was dismissed by many of the Liberals’ opponents who noted that as a centrist party the Liberals were likely to receive more second-choice votes and be the primary beneficiaries of such a model.

He regrets not using his first-past-the-post majority to push through a change to the electoral system that would mainly benefit his own party.