Tanjirou's dad is one hell of a 'too broken, plz nerf' plant.
My( probably horrible) understanding of this technique is similar to a sort of focus fire to your senses, but more of an action perception than thought perception. Maybe more of a simplistic world-view, where you are instead of 'Cutting off the bear's head' your just 'cutting a specific place' that the bear's neck just so happens to be in. I don't fully understand it myself, but it's still really amazing to see.