Mkay. But i resent this decision, as this is handwaving taken to an extreme. Justification of how a weapon functions is one matter, but the functoning itself is another. Vibration isn't just why a weapon "cuts better" (it doesn't) - it's an independant type of damaging which is in no way a mere addition to the orthodox slashing motion. Compare it to just having a monoatomic never dulling edge, and you'll see what i mean.

*takes out his "Epeen Warrior Bushido: Arena roleplay edition" handbook and writes down a single note, reading "Vibrobull - never in the sanctuary of my personal warforge", closing it afterwards and hiding it in his pocket*