React Native really only describes the UI aspect of the application. The backend code that is needed to access the native device API isn’t exactly the same, and accessing things like a camera aren’t straight forward across all devices. Although you can wrap these methods in interfaces and swap them out across devices, it usually takes an engineer with a good understanding of either android or iOS. This is the reason most people start with only Android, iOS, or Windows first, and the reason large companies have dedicated teams for each platform.
