I think you misunderstand placebo. The placebo is needed foremost to reduce falsely reporting positive and negative effects after the study. E.G. for most drugs

I think you misunderstand placebo. The placebo is needed foremost to reduce falsely reporting positive and negative effects after the study. E.G. for most drugs not beating placebo is essentially the same as zero or even negative effect. The rare exceptions when giving sugar water actually improves something because person thought they got a cure are themselves very anecdotal.