[jameside]

Companies with large, existing apps that want to use React Native definitely share the desires written out in your last paragraph. Facebook has this need in their main app. And at React Conf today, Leland Richardson from Airbnb just gave a talk on using React Native in "brownfield" apps and seamlessly sharing a single navigation controller across React Native root views and UIViewControllers and Android Fragments. The navigation library that helps a lot with this is here: https://github.com/airbnb/native-navigation