These are all developer centric points. What about users? Android already needs huge batteries, make everything run JavaScript and they'll need to be even larger. And forget computationally heavy apps? The hardware android runs on doesn't exactly have the best JavaScript performance.
I'm not sure you understand what react-native is... The app your users use isn't running javascript, it's not Facebook Cordova. You use javascript to compose the app, there's no javascript in the app you deliver to the users.
Pardon my incredulity, but if you use React, how can you not know that it uses a JS runtime? While it's not as bad as Cordova, you're hardly doing your users any favors in terms of performance by using React.
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