When React State Is Not Enough

In small components, React state works well. You keep data inside a component, update it, and everything stays simple.

Problems start when the same data is needed in multiple places.

For example, user data might be used in the header, dashboard, and settings. At that point, the state is no longer local. You begin passing it through multiple components just to reach the places that need it.

This quickly becomes uncomfortable. Components that don't care about the data still have to pass it down. Updates become harder to manage, and the code becomes harder to follow.

The issue is not React itself. The issue is that the data is now shared across the application, but the structure is still local.

This is the point where a centralized solution like Redux Toolkit starts to make sense.