I remember at times being hung up on which moves in various martial arts “just wouldn’t work.” This is actually a pretty common discussion from all corners of the martial arts world, and it is pretty much always a variation of the, “my style is better than yours,” discussion.
I recall practicing a technique in college in which badguy does a rear bearhug, defender bends over, reaches between his legs and grabs the attacker’s ankle, then sits back onto the attacker’s knee. “That’s stupid. That would never work,” was our analysis. As fate would have it, one of the 115-pound girls from our class was grabbed from behind on the beach during spring break and she sat back and busted the guy’s ass just as she had been taught. He got up and grabbed her again later and she, without analyzing the probabilities or consequences, sat back on his knee and busted his ass with the same technique a second time. His buddies laughed him off the beach.
A lot of folks like to discount all of aikido or even parts of Shotokan this way. At times, my buddies and I have subjected taekwando’s jump-spinning and flying kicks to this sort of analysis, but my personal favorite was a throw into an armbar in hapkido. We called this the “jump-spinning crotchlock” and we were sure this was the stupidest move ever conceived. Well, I still have some (probably untestable) ideas about the weaknesses of the jump-spinning crotchlock, but check this video out. It's not exactly the same as the hapkido jump spinning crotchlock but it definitely belongs to the same class of things. Whoda thunkit.