I guess I just don't understand the "why" so I am not motivated to look into it properly and at first glance it's introducing loads of new concepts. Maybe as my apps get more complicated I'll outgrow it but just plain Redux seems fine for me at the moment.
The hands down best reason to use react-redux is because if you use `mapStateToProps` and `mapDispatchToProps` you can keep your connected components 100% dumb (I like to export both the dumb version and the connected as the default). This way, when using something like react storybooks or and in your tests you don't have to mock your whole the redux world.
Any code that wants to know when an action is dispatched needs to call `store.subscribe(someCallback)`. The `connect()` function generates wrapper components that manage that process for you, use your `mapState` callback to extract data from the store, and only re-render your "real" component when that data has changed (thanks to a _lot_ of optimization work).
Without `connect()`, you have to manage the store subscription process yourself. More code, fewer optimizations.
