I am old enough to remember IMF "forcing" countries to privatize their services and industries (well, they still do).
It is beyond me Canada doing the same without being under duress, just for the sake of ideology.
I understand that in some places, for some services, it brought some prosperity, but they had guardrails in place. Like enforceable regulations and strong unions that covers the whole industry rather than a single company. But there are also places in which just creating those guardrails made public industry efficient without the need of privatization.
Mail/logistics is something that scares me to be fully privatized. From the difference in employees quality of life, to the quality of services, to the formation of monopoly or cartels.