They wrote the game for 30. And the animation system is intrinsically tied to the framerate.its not 60fps on the 5?
So they can’t just increase the framerate to 60 or it will double the speed of the animations. They have to carefully rework the engine to make this possible.
at least they're on the right path. It was on PC, but DS3 was much friendlier to high frames, and then Sekiro can be easily unlocked even higher than 60