In front of you stands your enemy, winding up to punch your lights out (and conquer the galaxy). So what do you do? Your right & left hands become one, you lift those hands high up to the heavens, and rain down some mighty judgment called "the doublefist." Game over, bad guys. Did every Trek series from TOS to ENT have the same stunt coordinator with the same bag of tricks for hand-to-hand combat scenes, or did TOS establish it as "combat canon" that the doublefist is the way to fight in the future (unless you're Sulu)? Is this what Kyle Riker should've called "the ultimate evolution of martial arts"? To minimize having to bring in stunt doubles, I would think that the doublefist might look more effective on-screen than a regular actor trying to throw an unconvincing punch that looks like they've never been in a street brawl a day in their life (since they probably haven't). Hence its frequent use. As as fan of martial arts (having trained some, but mostly watched), I can't say I've ever seen the doublefist executed during an MMA match. Is that because it's banned for being so absolutely devastating, or because it's so totally silly that no one would use it? But if it's the wave of the future, surely there will be no more nukes or even guns - just armies doublefisting on the battlefield until war itself taps out.