Sorry but no, under this guise any esoteric, homeopathic BS can gain ground. Effects of meditation, too, will have to either be objectively measurable. If they were not, it can be dismissed.
It's not medicine. Do you do null hypothesis testing after you pray? Some things just aren't objective - see psychiatry for an example of a super scientific approach to subjectivity. It still generally results in BS homeopathy that doesn't work.
the curse of causality you mean. it's hard to isolate the causes of things, but you have to do it, otherwise you don't know what works and you're drinking cow piss to prevent COVID or saying vaccines cause autism