My guess is one of a few things....
Maybe a person new to Android? When I first got my D1, I know most people being new to Android at the time (including myself)...were putting all our most used apps and widgets on the screen just because they can. I know that as I learned new tricks, mods, apps, etc...that I became more precise and strategic about my layout.
OR
Maybe they just don't have a lot of apps...and needed to put something in there for symmetry.
OR
Maybe they have not figured out you can switch from camera to camcorder and back with the camera app.
Yeah there could be plenty of reasons. I just though there might be a particular one and I was missing a functionality aspect or something.