Why did "early" react applications store serverside data in a redux store?

Question

I am working on a react app that has been around fairly long. It even has some class components. We are trying to implement react-query where it's useful.

That means we are removing a lot of dispatches that trigger API fetches. The responses are then saved in the redux store and read by selectors in a component.

Why was this considered a standard?

I have the impression that this somehow implements a kind of MVC pattern. I want to know the motivation behind such architectures.