If the situation is as you describe, what really needs to change is that the two left parties need to merge, or one of them needs to become such a marginal player that it doesn't matter. If the leaders of those parties can't or won't do that, well, then you get the situation that you have.
Personally, I find it galling that the massive Californian population of Republicans and Texan population of Democrats frequently go unrepresented.
You seem to believe in the primacy of FPTP voting in itself. That’s the difference.
You seem to be reading things into my words that I didn't say.
I get that more representative is good. I get that FPTP isn't that.
But what I said is, when their complaint is that the Conservatives keep winning, that makes their whole argument suspect.
That's not what they're saying. In Canada, we can easily end up with parliamentary majorities for parties that have less than 50% of the popular vote. Sometimes substantially less.
But the complaint seemed to be, not that it kept happening, but that it kept favoring the Conservatives. So, on the one hand, the fact that it keeps favoring one party is an issue. On the other hand, the way the complaint was made makes it sound like it's not coming from a position of objectivity.