I did not deny that they feel better. On the contrary, my point was exactly that they do feel better. And that it doesn't matter.
If you have a cancer, and shaman healing makes you feel better, you'll still die.
The scientific protocol allows to determine what is the source of the feeling, for example by comparing with placebo.
Does shaman healing work better than someone doing fake shaman healing rituals? I doubt it, but bring up studies that prove me wrong and I'll be fine with it, at least to some extent.