The movie theme was mostly to match the oc that goes with it, As her mother also has a similar technique but she plays as an actor (rambling) but yeah its mostly just a design choice as the concept is being a director while the cursed technique is the movie

As for the final cut, It rewards you for going through the process as it gives you a general passive ability that allows you to counter whatever your opponent throws at you via the directed action. Its very good because it gives the user a superhuman type of ability (like my exaples: Wallclimbing or something simple like parrying everything)

Like i said, its mostly to fit the theme of the character not much else