We've definitely experienced chaos when building large React apps. I don't think it's necessarily React's fault (though I'm not particularly a fan), I think the complexity is inherent in managing stage in both a client app and a server app. We've since moved to building apps with Phoenix LiveView and been much more productive. I've also built some libraries to give you the same benefits (single source of state on the server) when serving the front end in Elixir isn't an option: https://github.com/launchscout/live_state.