One definite data point I can illustrate, through personal experience. There is a treatment for trauma (PTSD etc.) called EMDR (Eye Movement Desensitization an

One definite data point I can illustrate, through personal experience. There is a treatment for trauma (PTSD etc.) called EMDR (Eye Movement Desensitization and Reprocessing) which has over 20 years of statistical evidence backing up it's efficacy. To date, no-one really knows how it works (there are a few good theories, and hopefully modern neuroscience can help here). Currently, it's "EBM". There is a huge amount of evidence to show it works, but no proven theory as to why. It's not "SBM" yet, as there still isn't a demonstrable mechanism or theory that describes why it works. homeopathy, antivaxers and scientoligists don't even have any evidence to show they work. They don't even count as "EBM".