The primary purpose of decision theory is to determine good decisions, which is what I meant to refer to by saying “for decision making purposes”. I don’t see how “expressing honest expectation” in the sense of your example would contribute to the choice of decisions. More generally, this sense of “expectation” doesn’t seem good for anything except for creating a mistaken impression that certain incredibly improbable hypotheticals matter somehow.
The primary purpose of decision theory is to determine good decisions, which is what I meant to refer to by saying “for decision making purposes”. I don’t see how “expressing honest expectation” in the sense of your example would contribute to the choice of decisions. More generally, this sense of “expectation” doesn’t seem good for anything except for creating a mistaken impression that certain incredibly improbable hypotheticals matter somehow.
See also: Preference For (Many) Future Worlds.