> A badly made native app is worse than a well built react-native app. There are plenty of anti-patterns that will ruin your native app.

Sure, but thats not an interesting observation unless there is something about react-native that makes those apps consistently higher quality than native apps.

On the other hand, like-for-like C/C++/Rust performs better than javascript in terms of CPU and memory use, so the null hypothesis is that re-implementing would , in fact, improve things. There's little reason to think a priori that the end result would somehow be worse.