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A bare closure would always see the latest values because it closes over them during render. And the latest useEffect closure will have closed over that method..
Here is the test suite for useEffectEvent and the test ensuring it does not provide a stable reference: https://github.com/facebook/react/blob/main/packages/react-r...
As far as I can tell, useEffectEvent is just the useEvent hook but renamed to reduce scope. useEvent was originally going to provide performance optimizations when creating event handlers in a function component and it was going to solve the issue of event handlers causing effects to re-fire[1].
Now it's just going to focus on the effect issue.
[1] https://github.com/reactjs/rfcs/blob/useevent/text/0000-usee...