And as I said that mindset you show is the major factor that will mess up a martial art.
And professionals when given a choice do something else.
Otherwise MMA as a system is not the discussion. The MMA system of cause and effect analysis is pretty much the best system you can employ.
And I have done a few different ones.
You appear to have moved your goal posts. First you were saying that industry training isn't evidence based, and you specifically noted SCARs. However SCARs was created based on evidence, and barring the logistical training issue, served those who learned it well, according to the Navy at least.
What I think you are doing is confabulating two things. Are some industry trainers fos? I am sure some are but here is the thing, they don't last long to actually be part of a problem. Basically it works this way...
1. Industry systems take evidence based techniques. As an example a fair bit of SCARs is based in BJJ.
2. They then put it together in a particular training format and each tends to have it's own lingo/priority/principles they focus on.
3. It then gets used like any other product.
4. It either works, thus showing that not only did they incorporate evidence based techniques, but that as the system worked in the field in is now evidence based.
5. It doesn't work, the business goes out of business.
If you were talking about some of those people that only sell personal defense videos and stuff I could kinda see your point. Some of them are basically what Master Ken parodies on his YouTube channel. The guy who got secret Ninja training and would have to kill you if he confirmed or denied he worked for the CIA kinda people.
We aren't talking about them. We are talking about people who have real operational experience and extensive training. Based on their experience they have made a determination as to what worked for them, tweeked it. That is using a cause and effect analysis.
It was then put into use by Military and LE etc and it worked for these organizations. Again a cause and effect analysis. Simply because these organizations don't post to YouTube the "effect" doesn't mean the effect doesn't exist. The simple fact is that since they are still using it, and spending money on continuing training is evidence of the effect.
Training is ultimately no different than tools. If the tools don't work they either don't get last the trial phase or get replaced in short order (like the infamous Chauchat machine gun of WWI), much the same goes for Combative systems. A good example of this tbh are Krav Maga and KAPAP. When trained correctly they both very well and we're created, over time, in much the same way as the functional "industry" systems. The only difference is that they were created by a "Public" Institution and not an "Industry."