That's why they call it being in practice. There are more medical doctors who are working with chiropractors than ever before. It is not a cure all, and you shouldn't keep going forever. But it certainly can be helpful for certain conditions. Actually, chiropractic is more mainstream than any of the ones you mentioned because it's licensed in all 50 states.
Many people understand how important it is to deal with their stress effectively.
The most simple techniques would be learning relaxation routines and breathing routines. I'm wondering how much of the science has been lost and recovered since ancient knowledge existed. I don't think that natural herbal remedies will replace conventional medicines. But I do think they will play an increasingly important role as better research comes out. Modern pharmaceuticals have saved many lives and alternative medicine is not about throwing that out.