Is "Show Page Shadow" really needed?

In the Options screen, I don't see why "Show Page Shadow" is so important to allow the user to turn on or off. The Help menu says, "Show page shadow sets whether a shadow is displayed under the page (this is only on-screen, it is not exported or printed)."

Just curious why anyone really bothers with this setting. Is it for something else that I'm not seeing?

Thanks.
-Zee

It is helpful for printing and is set to your printer's margins.
My HP printer has a 1/2" margin on one side and 1/8th on the other. My Epson has 1/4" on both sides.

I turn it off, so I'm glad that option is there to do that. Especailly when doing a web design, that page shadow can look like a background box that shifted outside the frame it was supposed to be in and can make it difficult to line other things up right where you want them.