I don't know what Discord has seen there, so I don't know if that's been resolved. They also state that transitioning to React-Native on Android would have been more time than on iOS , which doesn't mean that any alternative like Xamarin would have been better. It also reads like the team for the respective platforms is around 1 person big and they already have a running version for Android, so the cost of a rewrite and the time to retrain would not have been worth it, which is reasonable. On a greenfield project, different conditions apply.