Following Eric Lowe on Quora for a long enough time has taught me that "real-world fighting effectiveness" is the biggest red herring there is when it comes to martial arts. You either come out of physical violence alive or you don't, and while training in empty-handed martial arts
might save your life, training with a gun is the only
realistic self-defense training worth doing. Except, you know, for confidence. And if it's confidence you're after, breaking hard metal files with your bare hands is hard to beat on that front.
I really don't think hardly anybody in the developed world is ever going to face a true combat situation where they can actually use their empty-hand skills. It means they couldn't run away, lost their gun, and couldn't find a improvised weapon. The actual military doesn't train it any more other than for confidence. When you train MMA, you're really training for MMA competitions, not for any kind of real-life combat situation, cuz MMA won't help you there.
We did do bare-knuckle, few-rules sparring in Merpati Putih and it was legit my favorite thing to do. We hit and got hit hard, but I didn't get near the amount of sparring time I wanted. Even so, I'd have put my MP skills against anybody else's in a typical bar fight. Not now of course, those days are long long gone. My survival strategy these days is to de-escalate, and if that doesn't work, submit, and if that doesn't work, go momma bear and hope I survive.