[theothershoe]

On the positive side hooks provide a lot of options for declarative abstractions. I expect that to a large extent the built-in hooks will be used as building blocks for new libraries. I think it is likely that this will outweigh the negatives.

On the other hand, hooks rely on hidden side effects so that each hook invocation returns something different depending on which component instance in the component tree is being rendered when the hook is called, and the number of times the hook has already been called while rendering that instance. This introduces semantics that are unlike anything I know of in the language. A redditor, u/hardwaregeek, pointed out that hooks behave kinda like a state monad, albeit emulated with imperative side-effects.