Could you please advise with some inspiration, where or to which targets it could be used the new Effect Painter tool?

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I mean if I need an area to be masked and handled differently with adding some effect, then so far used to outline the object or now would use the Magnetic Lasso tool and would have the result.

In my opinion 'painting' a mask is not enough precise or not as much like the Magnetic Lasso. But probably just being not enough open for the new way, that is why asking for inspiration