Well, in truth, even if one has superhuman strength to the point of somehow being able to lift and swing around a hunk of metal weighing at least 160lbs (if going by it being composed of some form of high carbon steel and factoring in how thick it is), you'd also have to take in factors like the inertia; when swinging around something so large and heavy, the momentum of the swing would send the wielder flying off their feet. Let alone that the whole point behind a blade is that it's thin enough that when sharpened it severs the seams of things like wood or flesh. Sure, a blade as thick as the buster sword's might cause plenty of surface damage, if not just crush every bone in a person's body due to its sheer mass, but it would be a very lousy cutter due to how wide the edge would be.



Let alone how much unnecessary strength the wielder would need to put into just lifting the thing, and how much further strength they'd need to keep the thing balanced during a swing and retaining the additional strength to do damage with said swing. If anything, someone with such potent strength would do better if using a significantly lighter sword, like the standard SOLDIER sword in Final Fantasy VII, since the more strength you can exert into the swing itself without needing to compensate for the mass would make it faster, and therefore deadlier.