That's the first time I've ever heard anyone say that "MobX and React are conceptually similar". MobX is technically based on an "observable" paradigm, but it'

That's the first time I've ever heard anyone say that "MobX and React are conceptually similar". MobX is technically based on an "observable" paradigm, but it's a completely different API and mental approach than RxJS is. Also, while MobX is commonly used with React, it's really a UI-agnostic state management library (same as Redux). I really wouldn't compare MobX and Angular at all. To me they look like completely different tools.