[coldtea]

Why should it?

For one, it provides the welcome ability to bring topics up in Hacker News again, where they might get accepted better the second or third time (e.g because more people are online at the time of the second submission).

If the "deduplication algorithm" had "handled this case", then we would only be left with the first submission (a dead discussion), whereas as it is, HN users have now caught on to this PEP news and we have a discussion going on.