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useEffect, useContext, and usSyncExternalStore are no longer about "local only".

And you never use only local state. You advocate for Redux in a different comment which is literally a global state where you are going to have something suddenly change somewhere from the point of view of a component.

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You are misunderstanding me. I never said to use only local state with no global state at all. My point is that signals automatically make all state global because you can reference what should be a local value in a component, in another component entirely which is not at all connected to the initial component either in a parent or a child relationship. In other words, you are making a graph, not a tree.

For Redux, at least that's explicit, for signals, it's really not.

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