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Flutter, SwiftUI, Jetpack Compose: a whole lot of other platforms have been implementing React as their UI framework

No they are implementing Functional Reactive Programming, it isn't the same thing, even though common folks would say React.

https://wiki.haskell.org/Functional_Reactive_Programming

Isn't FRP more like RxJS/CycleJS?

If you ask the people who work on any of those frameworks I mentioned, they'll tell you they're taking the React style and applying it to their platforms.

I wouldn't say Compose UI/Flutter/SwiftUI are "implementing React", but if your point is that other platforms have better solutions than JSX (plus all the bloat React adds to applications), I absolutely agree.

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