I've never suggested that people don't need storage management. I completely understand why people want to see what storage they have left. It's a feature that will be enabled later, once we get external storage supported and people need to move things around.
I do think it's unlikely to be an issue in the short term, as people probably won't have enough games to run out of space. But it's something we know is needed and will be enabled later.
In the meantime, we aren't going to be randomly deleting your files IF you end up running out of space. You can manually delete any file as shown in the screen above. Like 360, that will delete the file but the save game will still be stored.
Save game files (and Upload Clips) are not user manageable. In order to prevent save-game collision across different consoles and different states, we manage the sync between the local save game and the cloud.
A copy of your save game is stored locally and synced to the cloud automatically in the background. If you loose internet connectivity, you can play offline and keep saving no problem. Once you reconnect everything syncs again.
The data that is "automatically" deleted are things like DVR caching and other OS or system level caches.
Hope that clarifies. With the exception of automatic save game syncs, data management features are still there. We need to add HDD capacity views and will have that feature in the future.