Okay, for the obtuse, the point being that if you have no direct experience with something, commenting on it's efficacy is inappropriate. One can say "my way works for me based on my anecdotal experience" but that doesn't allow you to say "ergo that will not work."
Also, in my experience, there is no such thing as a "non evidence based system." if you look at virtually any decent system, it takes elements from what you would call "evidence based systems". They may prioritize different elements, or not include others. The point of these systems is to try and impart basic skills that will work in a majority of encounters against your most common opponent, an aggressive subject who is NOT formally trained, in a compressed period of time. Now yeah, they use a lot of marketing speak, some of which is hyperbolic "our stuff works their stuff doesn't". That said, if the system teaches you using an elbow shield to protect your head from a round strike, while you blade to deploy your weapon, does the marketing speak suddenly make this effective strategy ineffective?
This isn't to say that SOME of these systems don't work, that the structure they put proven techniques in is simply not appropriate. The thing is unless you actually try the system you have no experience to base a conclusion on.