I am often fasinated by that, myself. It's so simple, and so "natural" to the human animal! Yet,
People are trained and taught limitations as well as fighting skill. Their TAUGHT that it is not powerful and impossible. But their punching style would not accomodate powerful punching in such a position.
But say, your a grappler, you train to grapple on the ground, very rarely do they punch while on the ground. And I watch these guys in competition in UFC and I see with a WC/WT trained eye, many opportunities to strike they never see. Because they're not aware it's a possibility. or have been taught it's not effective. So, guy has your arm getting set up for an armbar that YOU know too, so you anticipate it, fear it, and struggle against it. Using your other sometimes free hand to "grapple" the arm out. Instead of punching the very vunerable face and corkscrewing your body out.
Or a guy is mounted on top of you and leans over to try to choke you or set up for the armbar, you know it, fear it, fight it. It never occurs to you to punch the heck out of the face right in arms reach of you.
It's all what your trained as skill and limitation...
When I was in JJJ I was taught that to save the wrist in a kotegashi wrist lock was to stop the hand or jump over my wrist, or "tap out" say maite.
Then hubbie taught me WC/WT way to get out of wrist lock. And I got scared, my mind was for years trained that it could not be done that way. And I wouldn't listen and complain that I'd break my own wrist. I did finally learn it, but it still freaks me out. Limitation of my mind.
So they're told when someone's mounting you that all you can hope to do is out grapple them so they can't hit you. So that takes from the mind the natural animal instict to strike and fight back. Other options are systematically trained out of them. Very limited in their thinking of "fighting strategy". We've shown them and tried to explain what we were doing as we did it. They've felt it, seen it work, still they find an excuse it won't "really" work. Their limited by their mind.
Some have come around and seen it, and stayed to train but very few, and they usually didn't train MMA long.
The same when you tell them about WC/WT takedown defense. The believe it when it's done on them, which I respect their want for "proof", but they still believe it can't really be done in a "real fight" because it takes a little longer to train and learn. Alot believe that techniques that are more "complicated" (again a limitation of the mind) and take longer to learn will be forgotten in the heat of "battle".
I've found this to NOT be so, I and hubbie have used this stuff in competition, hubbie alot in real war and battle, and didn't just forget all wing chun when the heat got turned up. The more you train it, the less you have to think about it, or "remember" it. It just happens.
They just don't see what we see. And you can't make them see it. When hubbie goes to fight and if he's taken to the ground and does the anti-grappling, they'll see what their mind can only accept. That he's really using BJJ, although what he'll do isn't BJJ far from it, and obvious.