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incogn comments on Decision Theory FAQ - Less Wrong
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I don't see at all what's wrong or confusing about saying that an agent is trying to decide something; or even, for that matter, that an algorithm is trying to decide something, even though that's not a precise way of speaking.
More to the point, though, doesn't what you describe fit EDT and CDT both, with each theory having a different way of computing "what the world will be like if the decision is made in a specific way"?
Decision theories do not compute what the world will be like. Decision theories select the best choice, given a model with this information included. How the world works is not something a decision theory figures out, it is not a physicist and it has no means to perform experiments outside of its current model. You need take care of that yourself, and build it into your model.
If a decision theory had the weakness that certain, possible scenarios could not be modeled, that would be a problem. Any decision theory will have the feature that they work with the model they are given, not with the model they should have been given.