The other big disadvantage of Borda is teaming, where nominating more candidates makes a party more likely to win (opposite of vote-splitting).
It seems that to me the advantage of party-less systems in multi-winner elections is that, if your voting system succeeds so well that parties are no longer playing such a big role, you don’t have to later change it to be party-less to complete the transition. :)
...also I was going to ask a question about rated-runoff methods (i.e., did anyone consider the most obvious form of rated runoff) but in fact you answered it on your VSE page where you explain score-runoff voting. So, thanks for introducing me to that!
Edit: One addiitional note—it seems to me that the endorsement mechanism you came up with for 3-2-1 voting, where rather than specifying a full ballot of your own you can just cast a single vote for a candidate and thereby copy their ballot—that’s something that could be tacked on to a lot of methods, couldn’t it? As a way of simplifying them for people who really can’t handle the additional complexity. (Not that still really licenses that much additional complexity, but...) I guess it does have the potential downside that outside the context of something like 3-2-1 voting, where it can be done implicitly rather than explicitly, it might lead people to just short-circuit the process and subvert the point of the new voting system...
There are two things I would add to this:
The other big disadvantage of Borda is teaming, where nominating more candidates makes a party more likely to win (opposite of vote-splitting).
It seems that to me the advantage of party-less systems in multi-winner elections is that, if your voting system succeeds so well that parties are no longer playing such a big role, you don’t have to later change it to be party-less to complete the transition. :)
...also I was going to ask a question about rated-runoff methods (i.e., did anyone consider the most obvious form of rated runoff) but in fact you answered it on your VSE page where you explain score-runoff voting. So, thanks for introducing me to that!
Edit: One addiitional note—it seems to me that the endorsement mechanism you came up with for 3-2-1 voting, where rather than specifying a full ballot of your own you can just cast a single vote for a candidate and thereby copy their ballot—that’s something that could be tacked on to a lot of methods, couldn’t it? As a way of simplifying them for people who really can’t handle the additional complexity. (Not that still really licenses that much additional complexity, but...) I guess it does have the potential downside that outside the context of something like 3-2-1 voting, where it can be done implicitly rather than explicitly, it might lead people to just short-circuit the process and subvert the point of the new voting system...