I wrote this in a sibling reply, but I'll post it here too. Perhaps we are talking about two different things? I am talking about the efficiency of the voting

I wrote this in a sibling reply, but I'll post it here too. Perhaps we are talking about two different things? I am talking about the efficiency of the voting system itself, and its ability to express the preferences of the electorate. Note that I'm not talking about changes related to the election outcomes that such a shift in voting systems would potentially cause. Put another way, it would seem to be efficient to move to any voting system that would allow a voter to express more preferences than just one, since then we're getting strictly more information.