You would have a point there, except that the zoom button, as I believe it's called, behaves differently in different applications. An example, in some brows

You would have a point there, except that the zoom button, as I believe it's called, behaves differently in different applications. An example, in some browsers clicking zoom will zoom to the page width, however in iTunes clicking zoom shrinks you to the miniplayer. The different behaviours are confusing and difficult to remember, and not only goes against user expectations but isn't user-configurable.