I think the quotation below from GreenMed Info just about sums it up. It’s not that an evidence base isn’t important, it’s the fact that anything outside of that gold standard, even if it has been in use for thousands of years with no ill effect, is regarded as invalid.
A case in point is the way in which the Medicines and Healthcare Products Regulatory Agency (MHRA) is doing a wonderful job in making herbal medicine available only from large multi-national companies, whilst turning a blind eye to breast implants which they knew to be faulty years ago.
“Evidence-based” medicine presupposes that unless proven effective by double-bland, randomized and placebo-controlled trials, i.e. multinational corporation or government funding, a treatment can not be said to be valid. This “gold standard” obeys the “golden rule”: he who owns the gold makes the rules, i.e. No Money = No Evidence = No Legal Right to be Used.