Do these experts have any real working knowledge about the gentle systems they critique? If not, I would go find out for myself.
I don't know, but I'm convinced that the more gentle systems can not work on the street against an attacker. Take Aikido's wrist lock against a punch, action is faster than reaction, if he knows how to punch he will hit you, the answer is to strike back, or better yet run, if that's a viable option. Action being faster than reaction is known to all who know something of Physics. With all due respect to the practitioners of Aikido, which certainly has a beautiful philosophy, if not particularly practical against a determined mugger on the streets in my opinion and of those I have talked with and are experts in such arts as Wing Chun and American Combato. They are experts, I'm a beginner.