On the other hand, if the "everything else in the universe changes" model is established and understood, that can be an excellent way to streamline and decouple

On the other hand, if the "everything else in the universe changes" model is established and understood, that can be an excellent way to streamline and decouple things. I could see it working well with a React-style component model-- update the state, and anything derived from it automatically changes to match.