I think the main issue is the functional approach. Having a functional approach to state can be quite elegant, but ultimately the computer does not do functional. You have to implement a lot of plumbing to have stuff that is a bit performance (clojure), or just add a veneer of functional over what is essentially a normal state machine (emacs).
React works well, because it's only an abstraction over the real DOM. React only handles your app state. But the DOM mechanism is still very performant and very much imperative. But I don't think something like React would work well in a mobile app, because the UI tree is often very simple on iOS and macOS.
React works well, because it's only an abstraction over the real DOM. React only handles your app state. But the DOM mechanism is still very performant and very much imperative. But I don't think something like React would work well in a mobile app, because the UI tree is often very simple on iOS and macOS.