Doing a rain dance and concluding that it doesn't help also gives you another data point. Praying as prescribed in 50 different religions a whole lot more data points. And so on.
I'm not a nut screaming "It's all a scam, don't participate in modern healthcare!". Just noting that it's complicated, and the idea that going to a physician is always the best option should receive more scrutiny, because it's not black and white.