Media Sync doesn't really sync, does it?

Shouldn't Media Sync be called Media Copy? If you delete a song from your BlackBerry, and then run Media Sync, the desktop copies the song right back. That's not synchronization (unless I have things configured incorrectly). Is there an app that offers true synchronization, for Windows users, so that when I delete from BB it gets deleted from desktop on next sync?

It seems to be following the iTunes approach which is to consider the desktop as the master copy. I understand why they did this.