1. you can code share with iOS and Android. 2. the primitives provided by React Native solve the many bugs you get from low-level CSS and HTML.

there are many other reasons, I touch on all of them in my Next.js + React Native talk at Next.js Conf: https://www.youtube.com/watch?v=0lnbdRweJtA

I built https://beatgig.com with React Native and Next.js as the only front-end engineer and designer, and our iOS app and website share 99% of code across hundreds of screens.