I just learned about kishōtenketsu thanks to this great video on How To with John Wilson (https://www.youtube.com/watch?v=j-SwyF-Vvbs). I'm surprised that it's not as well known in the west, considering how many great directors use it.

Ozu is my favorite director, and learning about the 4-act structure helped me understand why - I always hated the third act of most movies, when character motivations go out the window in the interest of a big explosive ending. There is a lot of potential in kishōtenketsu structure to tell stories that are more realistic and introspective and don't require the kind of antagonistic conflict of 3-act structure.