Kind of the opposite. It's about being repeatable, and about the context. I can see plenty of evidence that fridges work. I can also see that my fridge works. I can also make my fridge work by using my fridge. And through daily use, I can honestly say that I'm an expert at using my fridge. I know how to keep the veggies fresh and the fruit fresh, and how to make my cilantro last a good week, if needed. But I couldn't buy a fridge in Europe and plug it into my wall outlet in America, because even though fridges work in general, and European fridges work in Europe, and even this specific unit I have would work for someone else, it doesn't work for me here. Self defense training is kind of like being that person, sold a 220 v fridge in a 110v environment. The salesman just says, "Hey, it's a good fridge. A great fridge. Keep it, and when you need it, plug it in and it will work. I promise. Look. Here's an adapter that makes the plug look just like those other ones."