I wouldn't get too excited. This is just a shell app, a few screens, no remote data, only temporal state persistence and nothing really functions (eg no form validation, no payments etc).

I assume it was used for some tutorial?!

Not saying you can't get away with not using redux at all but this isn't an example of that. Try mobx or unstated for simple state management.

Personally my projects tend to use it because I'm used to it. Once you get your head around it the boilerplate is not too much to deal with and it slides in so nicely with react. You just need to think in a functional way.

Also features like redux-persist make it powerful. You wouldn't believe the number of apps released on the stores using RN that don't persist state and simply restart when the phone runs out of memory or gets rebooted.