 The objection seems to be that the motivating cases for self-locating belief don’t do anything new; they don’t highlight any phenomena we shouldn’t already have been aware of from decades of study of Frege’s puzzle. We know from that puzzle that our theory of content needs to accommodate multiple ways of referring to the same object, and that cases of ignorance, similarity, and difference can arise from such multiplicity. While there are plenty of debates about which theory of propositions handles this puzzle best, your preferred mechanism for solving that puzzle should equally well handle the motivating cases above—or so the objection goes.