The balance isn't due to the pommel. It's with the construction of the blade itself. The katana has uniform thickness all along the blade because its specific construction is needed to compensate the weakness of the metal. European swords taper towards the tip, and so are actually longer for the same weight. The pommel is there for a specific grip (for one-handed swords like the Viking swords) or as a weapon in itself (to end them rightly).long sword has longer hilt with huge pommel as counter weight
According to some enthusiast who has done simple practical tests, the slight curvature facilitates in edge alignment through the swing. The blade tends to be more weighty at the blade, so even with poor skill of the weilder, the blade would be more likely to hit perpendicular to the target surface.The curvature of the blade is also not enough to increase the slashing damage
or probably just words of encouragementimma assume that since gramps had fought his way back from this world before these are actually magic katana
It's only as heavy as a European longsword. If you're looking for something that can actually chop, look for a falchion or an axe. A katana isn't meant for that. While the curvature is a result of forging techniques, it's also a desired shape. For one, it helps with unsheathing as it's meant to be a sidearm. The predecessors of the katana were much more curved, which are better suited for the warrior class who were usually mounted (horse archers basically). Curvature of the sword helped in quick cutting - meaning you cut and the blade would be less likely to get stuck - important for fighting while on a horse. Not saying that the katana is a decent cavalry sword. It's really just a sidearm.The main selling point is the heavier blade
Shadiversity himself said that the katana facilitates edge alignmentbut I think Shadiversity had already explained it fully