The hook originally was created to suppress this React warning:

Warning: Can't perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function.

In React 18, this warning was removed as it was determined to be misleading: See https://github.com/reactwg/react-18/discussions/82

AC:

• All instances of useSafetyFirst are thoughtfully looked through by a human to determine whether we still need the ref pattern (probably not)
• Migrate instances of useSafetyFirst to useState when it makes sense
• Remove useSafetyFirst if possible