Well, this is awkward. You told us that utility was strictly ordinal, that utility functions were unique up to a monotonic transformation. But whenever there’s a problem that requires them to be cardinal in some sense, you just revert right back to cardinality, don’t you? Remember how interpersonal comparisons of utility were supposed to be impossible? You made them anyways. You were never committed to the idea of ordinal utility. You just told us that to make us think we were safe. You lied to us.
In my newest post on Mises Canada, I critique expected utility theory on the grounds that it depends on cardinal utilities. Go read it and report back.