You can look at most things and say hmmmm that looks effective or hmmm that's silly. If the foundation and principals are sound then it should work. I say should because there is never a 100%. You test it in class, you break it down and look at the fundamentals. What you don't do is take my word for it because I tell u I tried it 10 times in real life and it works.
Reverse that however just because I stand in font of the class and show you how I did a flying reverse 360 back kick transferred into a headlock and its awesome I did it in 50 bar fights and never lost does that mean your going to pull it off and it works?
Funny thing about the term expert is it really means nothing. You can have 2 experts on the same topic give you totally opposite answers to the same problem. I see it in court all the time. You have your experts I have mine and we let the Jury decide who's experts are prettier and can entertain better. So of this is an opinion argument anyway.
My example to Steve was an FBI analyst that studied 1000s of Officer murders and assault and teaches an Officer safety class on it. To me he's an expert well to a lot of people hes an expert but to Steve hes not. That's ok its his choice. All an expert can do is give an opinion anyway.
Another Class I went to was with the head of the FBI's chemical agent program. Dude knew more about OC Spray, CN , CS gas, Mace, you name it if its a chemical that hurts he knew about it. Dudes not even in Law enforcement. He was deputized as a US Marshall because he transports large amounts of chemical agents all over the country to teach but he has no police powers he has never used the stuff on a real bad guy. He was at Waco however and the FBI trusted his Expertise to decide how much gas and where to pump it. Again not a cop at all yet trains 1000's of them. To me hes an expert. To some here because he never sprayed a real bad guy hes not. Your opinion but Id say your wrong