I have had clients in the past (unfamiliar with WordPress) ask where to add a new link to the navigation. But it’s not just about that.
When my clients don’t have access to anything from the “Appearance” section other than Menus. The result of this is that the “Appearance” section is no longer a collection of items (Plugins, Themes etc.) but a superfluous menu item that has no other function than to hide the “Menus” link since it doesn’t have a page of its own.