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While FPTP is trash, that system is kinda trash, too: if a candidate would beat all others 1-on-1 (Condorcet winner), then should that candidate win? Not according to single transferable vote/instant run-off.
Example
Who wins according to instant run-off? C. Who wins against every opponent 1-on-1? B.
Other methods also fail.
There are better methods: this nice table compares voting methods by a wide range of properties.