Thanks, Richard :). Re: arbitrariness, in a sense the relevant choices might well end up arbitrary (and as you say, subjectivists need to get used to some level of unavoidable arbitrariness), but I do think that it at least seems worth trying to capture/understand some sort of felt difference between e.g. picking between Buridan’s bales of hay, and choosing e.g. what career to pursue, even if you don’t think there’s a “right answer” in either case.
I agree that “infallible” maybe has the wrong implications, here, though I do think that part of the puzzle is the sense in which these choices feel like candidates for mistake or success; e.g., if I choose the puppies, or the crazy galaxy Joe world, I have some feeling like “man, I hope this isn’t a giant mistake.” That said, things we don’t have control over, like desires, do feel like they have less of this flavor.