[loquor]

You're right. But this is the natural progression for React. React emphasizes stateful behavior in components. UseEffects with specific dependencies are actions which depend on the specified variable-set alone, while all the other infinite variables can change however they like. This concept already exists when we talk about state machines.

That said, it isn't a smooth transition going from explicit lifecycle methods in class based components to useEffect hooks in functional components. But it refines the quality of the thinking, and the quality of the code overall, imo.