How is this different to using a React component installed from npm? You can look inside them if you want to, but don't have to. That is the goal of abstraction

How is this different to using a React component installed from npm? You can look inside them if you want to, but don't have to. That is the goal of abstraction. If you want to have no abstraction and show all state in your component, just don't extract any into Custom Hooks. Then it's really not very different to a class component.