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Presumably, this is only harmful on net if there isn't much difference in effectiveness between different methods? (The more variation in effectiveness between methods, the more useful it is to have that info, to help you choose wisely)
I haven't at all made this clear in the OP, but I don't much care about the object-level point; I really don't think meaningful change happens at the level of "let's campaign to stop people from studying therapy methods" or w/e. For me this is a case study in examining "belief."
