It's actually the default behavior for most bulletin board software. There are likely a couple reasons for it. One is to keep people from messing with older threads without being noticed. Editing a post doesn't bump a thread to the top, only adding a new post to a thread brings it back up again. Another is that in the worst case, someone could have a change of heart about their dozens or hundreds or thousands of posts, and either change their meaning or delete the meaning/content without even being noticed. By time most threads are a month or two old, they are pretty static anyway; even the exceptions to those do just fine by adding new posts to the end of them, which can happen forever.
In the rare case where someone has a legit need to wipe or change old content, I'm happy to do it manually.
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