@hub Not sure I see how that applies? At least not any more than it does now, because, well, Ontario is the most populous province and you (very roughly) distribute seats based on population.
We just don't fill those seats anywhere near the same proportions as voters want.
PR is a broad range of specific systems that can be designed to account for regionality and context. The point of the petition is to get something other than FPTP see-sawing us back and forth.