Remember that, previously, we said that it is not good to have application states in multiple places, because it makes debugging much harder. Therefore, we moved states from the input components to the form components. But now that we have two forms, we once again have states in two places. Therefore, we need to move the states up again. The most ideal case is where our application has only one state store.

However, if we keep moving states up, and passing the relevant state properties down as props, it can be quite un-performant. Let's say a component is nested 20 layers deep; for it to consume the state it needs, the state needs to have passed through 19 components.

Furthermore, let's say the same heavily nested component needs to change the state; it will have to call its onChange prop, prompting its parent to call its onChange prop...