It seems like most of what he's complaining about stems from the illogic of the MDI interface (http://en.wikipedia.org/wiki/Multiple_document_interface) and has nothing to do with the Quit command as such.

But really, what you want is for every document-editing app to open a single document, with maybe some tools on the side. The problems he mentions here go away and the "quit" menu option remains perfectly logical.

It's made a little tougher through Browser-tabs being the bastard-son of MDI. But seriously, multiple windows should be handled by the taskbar or some other thing.

Music is tougher question but considering every the Linux jukebox apps I know is a complete pig on resources, some way to quit pretty necessary.