Challenge

Rui hadn't come across too many, but most balance-oriented Martial Artists were supplementary in nature. They simply focused all their efforts on strengthening their balance to the absolute maximum to gain as much of a boost from it in combat as possible. 

It allowed them to stabilize their combat to the absolute maximum, increasing their offensive prowess by allowing them to maximize the rate at which they attacked without any need to worry about balance all that much. It increased their maneuvering considerably, allowing them to attack and evade in ways that other Martial Artists were unable to. 

It also improved their aerial maneuvering where balance became considerably more important. Martial Artists did not float in the air by leveraging some special energy to keep them stationary in midair. They pushed down against the air by stepping on it, thus balance was always and especially important when sky-walking.