> What I don’t understand the advantage for “state management”. Like, you build a new state object, and then mutate some pointer from prevState to nextState… that’s what everyone else is doing too.

Clojure's real super power is its reference type(s) (in particular the atom). Rich does an excellent job explaining them in this video: https://www.youtube.com/watch?v=wASCH_gPnDw&t=2278s