syncing is supposed to leave at least two copies which is clearly not the case here. have you read the article?

I did. And I know the article isn't about syncing - it's about Apple deciding they know best how to manage your digital media files. I'm just making a general comment.

The problem with "syncing" is if I delete a file on one device, what does sync semantics say should happen? It is ambiguous, which is why syncing is a stupid semantic. Copying files and deleting files is unambiguous.