With kill la kill it was the idea of the swords and armor being so intwined with the user they can freely manipulate it on the go. The sword can lengthen or shorten. the armor can change shape or from, basically they become like a second pair of skin for the user.
I like this concept. For Samurai, I'd go more sword based arts with the elemental styles than Bleach did. And I see this as soul of blade and armor as important to Samurai culture