There's a good reason for it. Sometimes a  on the first round may be due to lack of sufficient content rather than actual non-notability of the subject. If they recreate with more content, the article needs to be judged freshly based on db-bio standards, not automatically deleted because an earlier version didn't assert notability. (Of course, most of the time, it's a case like this where the subject just isn't notable at all, in which case just using  again works fine.)