And likewise, when you go to unzoom the App Window, you often miss, and close the document, or only unzoom the child window instead. Think of all the possibilities for error. This means that users are either surprised when it is there, or surprised when it isn't. The right mouse button, while clicking in the content of some windows, may bring up a menu that has a close menu, it may not. I'm being generous by not counting them individually.
Terms are inconsistent.
Imagine a new user asking, what is the difference between closing the application and exiting it. Just for fun, holding the right mouse button down does not work a menu the same way it does when holding the left-mouse button down. To work the right mouse button menu's, you must release the button before the contextual menu will appear. Which is inconsistent with all other menus. This will close the application, but of course it is called end task.