It's probably incase you accidentally double-send, since there was that twitchy period where the site would be lost and found, and you could never be sure if something really sent, or if it was eaten by the Keramon.
Also miss deletion - I don't talk to certain people at all now, don't need the messages anymore. And I really miss the Ignore feature. The lack of it plus one rather awful person is the biggest reason I don't post outside this thread pretty much.