Canada has a FPTP system but multiple parties. This means that it becomes possible to form a distorted, outsized government (even a majority government!) with a remarkably little amount of the popular vote. In 2019 the Liberals won the election and took 46% of the seats with a mere 33% of the vote. That is a remarkable distortion.

The argument as to why electoral reform is needed is because of this distortion and the view that the FPTP system itself is resulting in peculiar outcomes that do not reflect the actual wishes of the voting public.