SFN - Unused files

Is it the case that SFN will not erase old files from the 'Publish to' folder? I'm aware that the players will purge unused content in the pool when the storage is at capacity, but BA does not check the publish folder. BA appears to only add files to this folder. It might be useful for BA to analyse the current-sync.xml, compare it with the pool folder contents and old current-sync.xml and ask the user what they want to do with files that are no longer in use. I could see the publish folder becoming full of orphaned files with no easy method to discern which can be deleted and which should be kept.