I am looking to develop a cross platform app using React Native.
Will this be an issue because the JS SDK is a C++ wrapper?
If so, is there a better option for cross platform development? C# Xamarin?
We don't officially support any cross-platform tools.
You might want to investigate the Ionic Framework. They have a product called Capacitor which allows access to the the native layer. I am actually in the process of trying to develop two Capacitor plugins.