I worked on Xamarin app and saw how things worked there. I also think that it's a logical conclusion from these conditions:

1. You want to support N native platforms. 2. Each of these platforms has it's own way of doing this, bugs, etc. 3. Each of these platforms is being actively developed. 4. There are differences between those platforms. One doesn't have guassian blur, the other one doesn't have right-to-left languages.

RN is more flexible. And you can always contribute or build your own native extension to use.