I agree - I think React is simple enough that there's no reason not to besides the overhead of JSX preprocessing (which I suppose isn't required but I would definitely recommend). It really is more of a library than a framework, which is great for starting out because there are fewer concepts to understand. Then when you start adding more people and your application gets more complicated and you need to manage your data flow in a more consistent way, you can add something like Redux after the fact incrementally. As long as you don't let components become too large, refactoring isn't too difficult.