At a philosophical level, leaving aside the utter ridiculousness of Reiki healers shooting sacred energy from their fingers, this is the difference between real medicine and Complementary and Alternative Medicine whose practitioners, as they don’t treat real pathology, have never developed humility in the face of disease. It is easy, for example, for your acupuncturist to promise a perfect cure because they’re not really treating anything, just some nebulous mumbo-jumbo like a dysfunction of your ability to receive pure qi from the heavens. Side effects? None, of course. It’s perfect medicine because, despite being based on a completely imaginary idea of physiology that has no relation whatsoever to the way things actually are, it can magically target your imaginary complaint.
The whole thing’s worth a read.