Luis looking at the big picture, and still seeming to be a stand-up dude. His only cares are bettering people's lives. I can dig it. Now to drag the emperor and more clans into the unification!
Shuu wants to work hard on his path, but for her. His artistry is aimed to complement her. He might be a copper hammerhead, but gosh darn it if he isn't trying to do good for her like Shiina is for him.
So the skill doesn't let people randomly do something they physically couldn't do, it just makes sure the intended technique is fully optimized for efficiency when the user does it. Is that correct?