But if you cut someone in half you will likely go to jail regardless of the circumstances because it will freak a jury out more that emptying a full magazine into a BG. The prosecutor will push that you had more skill & jury would most likely assume that if you had the skill to dispatch of a BG in this fashion you would have the skill to subdue him without being lethal.
I might be splitting hairs here but much of defense & prosecution in BOTH criminal & civil suits is about perception &/or emotion. IMO cutting someone's head off or cutting them in half would be perceived as more vicious or would have a more emotional response with a jury at either type of trial.
...so "battle ready" is just a marketing gimmick.
If you're doing iaido (which is no less ridiculous of a way to get in shape than Pilates), you need a properly forged sword.
Also, Iaido is the art of DRAWING the sword... and can and is practiced with aluminum or other alloy bladed swords... Tameshigeri (target cutting, usually rolled tatami mats ) on the other hand, needs a sharp blade.
I was not going to get in on this, but bladesmiths forge blades by heating and beating therefore "smithing" is synonymous with forging.