I'm aware of that. But that doesn't change that the OP isn't asking for a proliferation of these animations across more sets than just Beam Rifle. Many sets in the game with beam-like qualities have alternate, hand-based animations. Beam's thematic look could easily be explained away into gadget gloves, or hand-based powers. Other weapon sets wouldn't make as much sense.
Like, not to sound blunt or anything, but if you want Dual Pistols to have a new set of animations, you can always make a separate thread. This thread is about Beam Rifle and its visual versatility lending itself to a potential different animation set. Would I like more animations for powers across the board? Yeah, that'd be great. But we can focus on just the one here, I think.
Even if "there's never only one," this is just an idea for one.