How to use "current" function?

I’ve read the HELP of “current()” function.But I can’t tell any difference after I add “Current()” to the dynamic components.I’ve tested some dynamic block with and without this “current” function. I got the same DATA. And if I scale this block, these two data will change together and got the same resoult.

what’s the correct way or the correct sence to use this “current()” function?

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