Here is the story on the special forces vs UFC fighter And they had rules and gear on. Anyone can be beaten if if their head is not in yet. https://www.google.com/amp/s/www.nbcnews.com/news/amp/ncna930261 It’s mostly in the training and not necessarily the “art”. Lack of rules? See what are real fighter thinks of that. Do you spar in these no rules classes. They train with rules then. Kano, the founder of judo, saw that unless one trains with resistance the person does not become effective. He took out those moves that were too dangerous to practice with resistance. Then trained with full resistance. And went around all of Japan and challenged the other arts and won. An American boxer did the same and won. It’s the training and not always the style. A good boxer will wipe the floor with most martial arts. Because of his training and conditioning . And most importantly he is used to a fully resisting opponent. Where sports martial arts seriously goes wrong is against weapons and does not account for other factors such as terrain , other fighters and weapons( and improvised weapons) as well. A sports MMA, judo, BJJ, instinctive might try to bring the guy to the ground where the ground isn’t the mat they are used to and break a knee on the hard ground. Or they train without many strikes such as wrestling and certain BJJ schools and open themselves to a punch. And the goals are different. The sports orientated practitioners will tend to try to beat the opponent rather than just get away. The show “fight quest” demonstrated this when they went to study Krav Maga. The MMA fighter had a harder time of it then the other guy. Krav Maga is great because it tries to keep it simple. But so is real boxing training. I hadn’t trained much in 20 years but the simple moves did remain and worked. I just started again and with a bad back and other injuries. I made some new injuries ( minor and annoying)but it actually helped my back. Getting my butt kicked by people half my age is great because I still give them a hard time of it. At this stage, the warm up kicks my butt and I’m sucking wind but I am hanging in there. I’m sore the next morning but I loosen up by the time of the next class. It’s a different art than what I took twenty years ago so I’m a white belt but it’s great. A white belt with some training time can still beat a lot of other martial arts with the black belts from the fake schools. And one doesn’t know a fake school until they seen a real school.