+But ... "plan to get hair surgery"? "Would get hair surgery if it were safer but for now are afraid to do so"? In what sense do these cases present a challenge to the discrete system and therefore call for complication and nuance? The decision to get hair surgery does not _propagate backwards in time_. The decision to get hair surgery cannot be _imported from a counterfactual universe in which it is safer_. People who, today, do not have the hair color that they would prefer, are, today, going to have to deal with that fact _as a fact_.