Bismarck.Bloodrose said:
»Just make it real/to scale and build some muscle and not be a wimp!
Being strong doesn't make an overly heavy weapon usable.
Admittedly, the Buster Sword is in a class of its own. And the Gae Bolg wouldn't have THAT much imbalance even with the bulkier head.
You're right. It takes skill and proper training, but the physical strength is just a starting point. Most of a weapon's usability comes from the utility and design.
Even then, there's a certain point where weight will be excessive. The large German Zweihanders tended to cap off at ~8-9 lbs.
The weight of european weaponry is grossly exaggerated. Katanas tended to weigh as much or more than the standard longsword.
Katanas typically weighed between 1.5lbs to 2.8-3.5lbs, which alone is more than enough heft to cause some serious damage.
European Longswords were typically lighter in comparison, and were swung far more clumsily. There was an art from to crafting proper blades, to match the weight of it's user, and the style in which they were accustomed to fighting.
a 54lbs Buster Sword *could* be swung comfortably by someone who had trained to use it, but that would take almost a decade worth of physical endurance training alone, to get your muscles to a point that could even swing it, let alone use it. And I'm not just talking about bulking up either. It's going to require extreme endurance training.
The kind that SOLDIER members would have gone through (aside from the Mako infusions)
Interestingly enough, it would actually be harder to wield Sephiroth's Masamune than the Buster Sword.