Thanks for picking that up!
Two quick thoughts in response:
- It’s not because there are many wrong ways of doing something (or answering a question), and indeed that we can say one way is more wrong than another, that there must be a single right way.
- The assumption that there must exist a single optimum answer to an allocation question rests on a strict, stable equivalence between multiple uses of the resources. That is not true for a single individual, with ill-defined and fuzzy preferences, and by extension not true for a whole bunch of individuals.