Most games have to work on different sized screens. This can be different size phone or tablet screens, resized browser windows, display resolutions, and so on....
I do NOT find this helpful! I find setting a number of rules for objects to be set in relation the viewport is much, much, much more helpful in order to truly be able to support any screen size, and that it's really not all that simple! I went in circles with this article for a good day before nearly writing it off as useless, however, I will say I learned a lot from just changing the screen type.
so what did you figure out... i just kept ignoring it until i cant anymore.