Question concerning ability to make cut less than thickness in Bend area

In the What's New document in the Chapter on Sheet metal (The first item) we can see that it now possible to create a cut in the area of a bend that has a depth less than the thickness of the part.

I have tried this out, it works most of the time as long as the Geometry is not too complex.

The question I have, is why do we need this function. Can you give me an example of its application (use)?

Does anyone have any ideas.

Thank-you

SolidworksSolidworks 2012 Beta