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RxJava and RxSwift are Reactive Programming, not Functional Reactive Programming. FRP includes behaviors and hence truly continuous values and intercepts. RP has to use subjects, side effects, hot and cold observables and other nonsense. They’re quite different even though most online commenters tend to be unaware that there is a difference.

RxJava's Github says "RxJava is a Java VM implementation of Reactive Extensions". The Reactive Extensions website claims it is "Functional: Avoid intricate stateful programs, using clean input/output functions over observable streams." You're saying that it's not?

In my experience React Native is wonderful for iOS and nowhere near as good for Android.

I find the constant breaking changes troublesome as well. I've never seen that with another framework and am hoping that things converge towards stability.