That's not the goal, the goal is being able to split the vote. Politicians will still make the individual decisions, except where they arrange referendums (like usual).
This sounds like a heavily US/UK-centric analysis. In the Norwegian parliament, there are usually between 7-8 political parties represented, seven of them are pretty much regulars; even if some of them are close to the thresholds for representation.
Neither of the two political parties I could consider splitting my vote between are likely to drop out of the next parliament (quite the opposite, in fact; one is part of the current government, one was part of the previous government), I just don't want to exclusively vote for either of the two.
But someone's motivation is irrelevant for the inferiority or superiority of voting systems, anyway. That's just a distraction.
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