If you don't have a system to choose specific counterfactuals, that leaves you with all counterfactuals, that is, all world-histories, theoretically possible and not. How do you use that list to make decisions?
That is my point. That is what the decision theory is for!
I reassert my claim that:
Decision theories tell you what options you have: Pairs of actions and results.
Your null-decision theory doesn't tell you what options you have. It tells you what options you would have, were you God.
Y'all know the rules: