I suppose it depends what kind of energies you are trying to focus.

Thinking about it and looking into it I guess I can understand If you're preparing for an op or going into war or something, with the samurai and knights i can understand that - reaching a state where the sword or bakkai or whatever is an extension of your own body, your reach/strike/arm etc.

I guess i can understand it in some situ. Just nothing i've really explored before - hence i'm a novice to the ideas.