My preference is to base the outcome on who wins the seat.
Define: "who wins the seat"
My definition of winning a seat would be that a candidate has the support of at least 50% of voters who cast a vote in that seat. (Note: I have a problem with the high % of voters who do not vote in this country, but that's a different argument). PR is one alternative that does a better job of reflecting the wishes of the electorate. Another is Preferential voting if PR isn't an option. Australia uses the latter, and it works better than FPTP does (still not as good as PR would be, but better than FPTP).
FPTP in far too many cases does not provide clear and indisputable evidence of this in far too many cases. At the 2019 GE, 421 seats were won with >50% of the vote, while 229 were won with less than that. Of those, 21 were "won" with less than 40% of the vote. Now, admittedly, most of those 21 were won by a non-Tory.
85 of the seats won with <50% of the vote were won by a Tory. Of those, I've identified 40 where it is likely the result would have been different with an Australia-style preferential voting system. Not all to Labour, some would have gone SNP, Lib Dem, or Plaid. That would have seen them fall 1 seat short of a majority and either forming a minority government propped up by a minor party, or a formal coalition led by the Tory party. But it certainly would not have put is in a situation where the excesses of the Tory party couldn't be challenged.
Given the overall national vote share, that would have felt like a "fair" result to me. Far more people voted *against* the Tory party than for them, however the Tories did have the largest vote share.
"First Past the Post" is such a bad name for the system used today. In far too many cases, *no one* actually gets past the post IMO. It would be better called "Nearest to the Post".
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