Obviously, there is something dubious about evaluating your decision theory based on its performance on the float/fall question.
Decision theory is not about what decisions you will encounter, but how to handle those you do encounter. If you are presented with the option of floating, that is the one to take. That you will not be presented with it is not a defect of the decision theory. We can still talk sensibly about what to do if you suddenly remembered you were wearing flying boots.
The question of what range of decisions a decision theory should handle is not a question for that decision theory, unless you’re going into the further reaches of exotically self-reflexive decision theory. In which case, you would have to be doing mathematics (as some people are), instead of elaborating verbal formulations.
Decision theory is not about what decisions you will encounter, but how to handle those you do encounter. If you are presented with the option of floating, that is the one to take. That you will not be presented with it is not a defect of the decision theory. We can still talk sensibly about what to do if you suddenly remembered you were wearing flying boots.
The question of what range of decisions a decision theory should handle is not a question for that decision theory, unless you’re going into the further reaches of exotically self-reflexive decision theory. In which case, you would have to be doing mathematics (as some people are), instead of elaborating verbal formulations.