STV is just a type of ranked ballot though, it’s not a separate method.

Working in consultation with data scientists and election statisticians, I’m sure a government could easily determine which methods would meet all of the criteria necessary to ensure a fair and free election. The problem is with calling a referendum in order to implement it, which I don’t think is actually required.

It literally cannot get worse than FPTP. I am okay with basically any voting method except FPTP and MMP (it’s just FPTP with party list seat linkage).