How do You Know What Works?
Competition is a proven means to demonstrate the efficacy of combat sports and martial arts technique. You can wave your arms around while making gurgling noises, but as Bruce Lee put it, "If you want to learn to swim jump into the water." As an aside, Bruce Lee couldn't swim (not speaking metaphorically here, but actually).
Learning what works and what fails through competition reaches its peak in mixed martial arts, and has revolutionized the practice of martial arts generally. You can call that martial arts in the arena. But that's not the only way to learn what works, and what gets you hurt.
The rise of cell phone video and security camera footage has opened up a second means to determine the efficacy of any particular martial art, combat sport, or technique. Call it martial arts outside the arena. This can be roughly divided into several main categories:
However, there is another side to knowing what works, and that's knowing what doesn't work. Most industries do not have a significant number of participants that are lunatics. There is no group in truck driving that advocates for doing it with eyes closed, for example. Unfortunately, martial arts in some quarters follows not the Samurai code of Bushido (be brave, never wear socks, etc) but instead enthusiastically practices the ever-entertaining art of ...
Note: The proper pronunciation is "bull cheat."
What is Bullchit?
The first person who establishes that Chi is real in the sense that it can impart abilities not otherwise available, will easily win the Nobel Peace Prize, for so radically increasing humankind's understanding of its capabilities. As of yet, the only quality earned is ignobility.
Chi Blasting only "works" on what pathetic-at-best Chi Blast monger George Dillman referred to, on a debunking National Geographic episode, as "Non-Believers." If you think Chi Blasts work, when one is overtly beamed your way you may pass out or do the hokey pokey. In a group situation, the delusion can be magnified. The passing outs is a product of conditioning - people believe that what they are practicing is real, and when they see other people falling down it only reinforces that misbegotten belief.
Unfortunately for adherents, if you don't think they work, then they don't. Thus their use in a self-defense situation is nil, and much worse. If you are being attacked and the criminal believes in No Touch KOs, and you somehow announce mid-beating that you are about to unleash a Hadoken and then do, it might, possibly, work. But criminals are not that stupid, sadly.
The good side of Chi Blast adherents is that they are funny.