I doubt they will ever create a shared storage of any sort. It would be pointless to prevent mails to be sent to yourself but instead allow you to store everything in a convenient box for easier pickup...

I doubt this will be a hindrance for me since I don't plan on having mules (we'll see later down the road if I can live without them) but I can understand why you are upset. We'll see if this proves to be effective against RMTs...