Great point about considering efficiency. With FPTP you save time in the poll booth because you can only put a single mark on the ballot.
Too bad about all the inefficiencies outside the poll booth with FPTP. Watch the polls to see if your favourite has a chance or you need to vote strategically. The Conservatives get 100% of the power with 40% of the vote and policies that pander to the bigots on the right. Deal with policy lurch and half a dozen new laws that violate the Charter with ensuing court cases. Next, the Liberals win with 40% and reverse many of the laws that weren't outright Charter violations.
The really simple (useless) FPTP ballot comes at a high cost.
"Simplicity" is often given as a reason in favour of FPTP, and "complexity" against PR, but when people make that argument, I think they must have a really low opinion of voters' intelligence.
First Past The Post was a system from the colonial era, and I mean real 18th century swords-and-flintlocks stuff. There were just two parties "Tories" and "Whigs", and all their candidates were lords or guildsmen. People were still around who has witnessed witch-burnings in their youth. That's how out of date FPTP is.
More to the point: The "all you have to do is put an X by your candidate" simplicity of FPTP is from an era where most voters couldn't even read or write; to sign their name, they probably marked an "X" too. Are we so illiterate today? No. Uneducated? No. Have no access to news and opinions except that which a horse and rider messenger can bring to your town? No.
FPTP has been obsolete ever since there were more than two parties in Canada's elections: FYI that's been the case for a century now.
What level of "complexity" are we really talking about with Proportional Representation then? Not much - this is a scare tactic, and any realistic look at it makes it clear you're not going to have some sort of existential crisis while in the voting booth.
The ballot is supposedly" hard to figure out? If you can order from a restaurant menu, even a drive-thru, to figure out what you want, without screwing it up, you can vote on any PR ballot. Seriously, how hard is it to mark down one choice over here, and another over there? Or prioritize candidates or parties by writing down "1, 2, 3, 4..." beside someone's name?
The counting process is a mystery? No. It's all explainable, public information by law; subject to facts not interpretations - who wins is not somehow a matter of opinion. In fact, the winner is more able to say they really won, because a real majority always still wins, unlike today where a "winner" might have nowhere near a majority of votes.
I could also go back to the restaurant analogy again. I'm no chef, so when I order a steak dinner with garlic fries and honey-glazed carrots, do I really know how it's made? No. I can find out how it was done if I want to, someone can explain the recipe, like how the chef trimmed and spiced the steak, clarified the butter and whatever else - but I don't need intense levels of detail in order to eat my meal. All I care is that I got the meal I asked for. asked for steak, so don't "FPTP" me and tell me I can only ask for steak, but end up with either Thai chicken wings or bland old hamburger, because I had to really choose the one I didn't want.
Really the only sulky sour grapes there will be from the lazy media who will have to throw out their "horse race" style of coverage, with the expectation they can "declare" a victor before the ballots are even counted. The media hates complexity - they love these binary choices,
and you can see it in their campaign coverage and debates where they try to actively avoid talking about the 3rd or 4th forces in any race. They want it to be two, only two, because that means it's just about leaders' personalities, and they don't have to explain what party policies actually are (much less what they mean). "Turn left or turn right, nothing else is even possible".
Is that lack of choice even acceptable to voters anymore? No. Like I said, not for a century now - because the age of "two choices, one X" is over.
Other nations have managed PR voting, without the voters being stumped or the ballot-counters screwing it up, so what are we if we say we can't handle it - idiots?