That wouldn’t be possible with the current system.
How is that not possible with the current system? Where are you getting those figures?
Right now, you have a majority with only 20% of voters, 80% of the people are not getting heard it does not matter where they live. This is an edge case of Ontario, but as OP said the figure does not get much better across Canada. https://en.wikipedia.org/wiki/Gallagher_index#Canada
The only thing that proportional representation tries to do is matching the votes with number of the seats without discarding votes. With proportional representation, if enough people vote for you, you get a seat, that is it. They don't throw those votes away. Right now, it does not matter how many votes you get, if you get 15k votes, and the other candidate gets 15k+1. You have 15k voices silenced.
Are you mistaking proportional representation with something else? Or just being intentionally malicious?
Giving your preference for disenfranchising 80% of voters, I bet it is the second.
Things like this are the reason why the current system was designed the way it was.
No, it was not. Alberta used to have proportional representation, the reason they ended it is that the party in power thought they could stay in power for longer, but it backfired, and they lost to another party some elections later. (it seems that Manitoba and BC had similar stories with PR).
The current system was not designed the way it was for those reasons you are pulling out of a hat. It was just so the parties in power could have better control on who vote so they hold it for longer.