There you hit on what I was trying to say in another post: as effective. The ping pong analogy is good for this point. I used to play pretty well, holding the paddle in that odd manner you sometimes see. It's a less-effective manner, based on the evidence we have. But it worked quite well for me and the guy I picked it up from. So, less effective isn't the same as not effective. That's what I was getting at.It is good logic IF there's a reasonable expectation that evidence would exist. If you see a ping pong style that insists playing holding the paddle upside down is better, I wouldn't refute that without evidence. If I then find out people have been doing this for years, but no one in the olympic ping pong team holds the paddle that way, it would be reasonable to assume it's not as effective. There's still no evidence, as no one's proven that holding the paddle that way can't win you gold if you get good enough, but I think there's a fairly reasonable deduction that holding the paddle upside down isn't as effective.
Now, if someone came about and started holding the paddle that way and did win gold, or a lot of high level competitors started doing it and succeeding, that new information might change my view and I might try holding the paddle the other way and giving it a go.
I think MMA training might be the shortest path to fight competency, except maybe compared to boxing. But that doesn't make a longer path ineffective - just makes it a poor choice for fast fight prep, and probably too inefficient for competing in that context.