This button exits in GNOME 3 as well, except they ruined it. Alt+Space still brings up the menu, but they took away all the keyboard shortcuts for the menu ite

This button exits in GNOME 3 as well, except they ruined it. Alt+Space still brings up the menu, but they took away all the keyboard shortcuts for the menu items themselves, so what used to be Alt+Space x to maximize now becomes Alt+Space x, nothing happens, you reach for the mouse and click maximize. I suspect the problem here is more related to GTK3 and the new window manager, but I can't prove it. I just know it's broken now.