I actually agree with this and liked when you could see the full behaviour of a particular concern within a component, for example, its shouldComponentUpdate()

I actually agree with this and liked when you could see the full behaviour of a particular concern within a component, for example, its shouldComponentUpdate() method. But now, with hooks, you might instead have 3 or 4 useState hooks, each of which could cause a component update. Worse yet, with useEffect hooks, you might run into the interdependent dependency array problem, which would cause a refresh loop. Now it feels like your components have now become containers for smaller loosely coupled units of code with their own behaviour and life cycles, all of which may result in lower coherency as well. I actually voiced some of my concerns a while ago in a slightly satirical portion of my blog, called "Everything is Broken": https://blog.kronis.dev/everything%20is%20broken/modern-react-is-broken https://blog.kronis.dev/everything%20is%20broken/modern-reac...