The missing information here is that the party that ends up winning can learn how it won that seat. Example, let’s say party A wins, but only 30% of the district put them down as their first choice, but then they get another 15% because they were the second choice for those people behind party E. Knowing they were essentially elected by people supporting Party A and Party E helps them for a coalition with Party E and diversified their policies somewhat since they don’t want to get elected with the help of people who support Party E only to alienate them.
Alternatively, you know how in the US “splitting the vote” is a bad thing? With FPTP it’s totally fine because it helps to blend party policy together rather than encouraging increasingly more extreme views and in theory makes it easier for representatives from different parties to work together. In theory anyway.
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