Improvement: fetchFunc MUST always be memoized

[activenode]

The refresh function refreshes when the fetchFunc does. But in fact, it doesn't make sense per clean coding principle to change the fetch function at any point as all dependencies can be passed and will be passed to the function.

So essentially, right now the downside is: by just passing a function, the refresh function is never memoized as it always refreshes.

Rethink this behaviour.