I agree that EBP is much needed to substanciate our profession (yes in the USA we need to prove ourselves and everything about our profession to be considered equals in the medical world), however, many studies have a very small group number and are often a single subject study. It's like telling the physiotherapy community: "I tried this and it worked", which may or may not work for your client. Isn't this quite similar as having a conversation with a fellow collegue?
Just a thought!