[saosebastiao]

All of your comments are fair, although I'd dispute that some codebases are much harder to scale than others (x64 Assembly most definitely begs to differ), and javscript is most definitely one of the worst of the general purpose languages. But even then, as far as realistically cross-platform languages go, javascript is actually one of the best (wow).

I happen to think though that the web is an obvious use case for the React model, and phone UIs are only slightly less obvious low hanging fruit that has worked out really well.

The scalability of the model, however, depends on how much workload you can offload into the React system, and with VR, there is only so much you can do. Even if React is handling all of the rendering with extremely efficient native code, you still have to have a your own full 3d timespace model with realtime response demands. Maybe it will work for extremely basic use cases, but at some point having a familiar language becomes a relatively tiny benefit when compared to an efficient runtime.