Canada uses a first past the post system for federal elections, which usually boils down to a two party state equilibrium

> It would seem weird for a candidate to reform how voting works knowing it could negatively affect their side, right?

Possibly, but I want to believe that politicians can put country over party (I haven't found a huge amount of evidence for this though unfortunately)

This means the conservative party often ends up getting more power since they're "first past the post" even though the majority of the population may not agree with them.

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.