[seivan]

React-Native isn't just a JS-wrapper, you're trading away language safety features (e.g Swift) with features to help with transient state (React).

Of course you can mitigate that with RxSwift, but it only goes so far.

[warcher]

Concurrency is a real bear on mobile, and it isn't something that can be ignored (a la the web) when you're that close to the metal. I'm an explicit js chauvinist, so maybe they've gotten something together on that front, I wouldn't know, but that's a very serious concern of mine with js-outside-its-proper-place-within-the-DOM.