My post was aimed at the sort of person who would vote in the Erewhon system, but not the real world; your objection applies to both. This post does a good job estimating the utility of voting in a close election; it seems to make sense for most rationalists in most elections at those stakes.

Re: rational and optimal, I'm countering a meme that calls it irrational to vote. I recognize that "optimal" is better usage here, but I wrote this for a wider audience that experiences different connotations.