Ok, I see what your saying, and the trash can basically means "oh, oops, I didn't mean to press and hold this icon and move it to a main screen" when the icon wasn't already on a main screen. This still seems really strange to me to represent an "undo my accidental press and hold" with a trash can. When I didn't know that press and hold moved icons from the master list to a home screen, I assumed the trash can meant what it does on desktop OSes, ie Delete.