You don't have to play hybrid BR, and right now for NA, missing the 85 skill, as well as the extra points the higher cap brings makes hybrid a difficult choice. If you really want to stick to just katana, you should max out precision stance as well, and get used to toggling it on and off. When applicable, it is a sizable damage increase over using basic stance only, but you have to make sure you are turning it on at the right time, and off at the right time.

If you don't want to deal with stance dance gameplay, then you really might as well take all the bullet bow stuff at the bottom right, because at least that might be useful on occasion when you can't melee stuff.