Agreed, it employs a lot of good functional concepts and shifts you into another kind of "reactive" thinking, where the render function is a pure representation of its state. This actually allows you to "declare" your state and its mutations in a way that perfectly executes your business logic and presents it in a single pure function, but generally, it's hard to think with pure functions for some reason, and side effects are imminent, as well as some asynchronous black-boxed action takes place. Actually – for many, side-effect becomes a patch for conceptual blanks in knowledge about functional data flow in its pure form, and you can tell who really understands it just by looking at his side-effect usage. In the end, what makes the library so appealing is that you need just 6 basic hook functions aligned together in a proper way to describe any kind of state and functionality user interface needs, and it actually performs top-notch and takes little space.
