Wow. The 30 minutes you saved by using parse turns into a major headache. This makes me hesitant to use react and react-native.
I'd be hesitant to use anything released by a large company that they don't use themselves for their flagship product(s). Angular 1 comes to mind. I believe Facebook does use React for facebook.com, but not React Native for anything in production yet.
They're also putting a lot of resources on it and hiring some smart people (Dan Abramov).