No matter where we are in the world, things get a little emotional when we talk about evidence based practice!!!
There are a couple good discussions regarding the same subject under the tag "ebp".

Personally, I feel there is something very important to remember. I agree that evidence-based practice is extremely important. To validate what we do to insurers, funders, clients, other professions...... That is the reason that I read the amount of research that I do.
BUT...research has to start somewhere. It will start based on a case study or even purely a therapist's intuition.
I love citing research when talking about treatment plans but I am also very interested in learning more about the fascial system and myofascial release....bit of a contradiction really. But...it just makes sense to me. And once I learn a little more, apply a little more maybe I (or someone else who actually wants to do research) can make it make sense to other people?? (Or I'll figure out I was wrong!)

To ask someone to provide research to back up what they do is fine. But I don't think we can totally discredit everything they have to say if they can't.
Example: According to research, not too long ago I would have to have people doing VMO setting exercises and taping for PFPS and nothing else. My gut (and my eyes) were telling me something else so I had people work more on gluts, body awareness... And (yahoo) now in the past couple years I'm actually seeing research backing that up.
I would be surprised if there isn't anyone out there that has done something treatment wise that just makes sense to them then later (maybe months or years later) gets the pat on the back from a research article that tells them they are on the right track.
So yes....read research, critically evaluate it, use it where you can, let it optimize your treatment but remember not everything has been studied yet. Your unproven theories might be the outcome of the next body of research.