I am not a web developer. But, in general, I don't understand why state management is considered to be a big difficulty needing a framework. We have been writi

I am not a web developer. But, in general, I don't understand why state management is considered to be a big difficulty needing a framework. We have been writing complex standalone apps for decades without needing frameworks and they manage state just fine. At least for medium size GUIs, state management can be done with a few simple architectural conventions, MVC pattern, etc. May be I am missing something special to web applications...