I'm saying MobX is not the final answer for React. Behind React is the theory of uni-directional data flow. Observable in MobX looks nice and it fixes uni-directional data flow in JavaScript syntax of assignments. Seeing from ClojureScript and other languages that implemented persistent data structure by default, MobX is just a tricky solution designed for JavaScript. And ClojureScript handle uni-directional data flow well too with persistent data and atom type.