I wrote a form library once.

Once.

It was called React Redux Form, and using Redux for forms was a good idea, at the time (don't use it). In fact, my library was written as a response to Redux Form, and both libraries soon discovered that the idea of using a single global store to store all of your application state is a really, really bad idea.

When all of your forms live in one single store, state is easy to manage at first. And then, every single keypress starts to lag. It's a terrible user experience.