The thing i like about the Australian and the UK Parliamentary system is that the MPs ultimately choose the PM. The Party System that Canada has adopted essentially puts the petty party ideologues in charge of picking the leader at Party Conventions.
That's how we ended up with a nitwit like Justin Trudeau with no leadership ability or no political vision beyond a slavish subservience to feminism, homosexuality, radical environmentalism and, multiculturalism. His ideological franchise exists solely in the Liberal Party of Canada.
What this does is disenfranchise the ridings and and electorate from choosing the Prime Minister through their MPs. It's really why a mediocrity like Harper held on for so long. Scott Morrisson took over from his predecessor, Malcolm Turnbull, when the latter proposed eviscerating carbon taxes on the country and supported same sex marriage and was given the boot by the Conservative alliance.
Rather unfortunately, in 2016 Tory MPs elected May as PM, who turned out to be the worst British PM since George Canning, but that's only because he was PM for just four months in 1827 until he died from severe pneumonia and a gunshot wound inflicted by a Cabinet colleague.