What's the point of using a cross-platform tool if you're only targeting Android?
What's the point of developing on Mac for Android if I don't like Macs?
Also, why am I facing a (partially hostile) interrogatory right now?
Sorry, not being hostile. Just curious why someone would use React Native if they don't have a Mac to build/test on iOS. Why not just go straight to Android?
Well... Javascript experience, code reuse between web and app, the possibility of later porting to iOS, etc.