Part 1 was about waiting well. Part 2 was about not waiting at all. This one is about a value I needed in a component that never created it, and about the ten minutes I lost putting the hook in the one place it can't work.
If you've read Part 1 on useActionState and Part 2 on useOptimistic, both of those hooks answer a question from inside the component that called them. That was never a problem for a two-field newsletter form. It became one the day I split an order form into separate pieces, payment details in one file, the place-order button in another, and both of them needed to know the same thing: is this thing submitting right now.
The setup that made prop drilling look reasonable
Here's roughly what the form looked like before I touched useFormStatus at all.
import { useActionState } from "react";
