That's not true.
The problem with letting submitters log in and track the status of their submissions is that it gives spammers a better look at what tactics are working and which aren't; making the problem larger.
Such a system could dispaly "Pending", "Added", or "Deleted" depending on the url's current status, but most of this info could be gleaned by looking in the category and/or a search. Any additional information would be used to abuse the system.
Webmasters who submit zero-content sites could read the guidelines and realize their site isn't likely to be added.