Member Rara Avis
acire is right, and that's the principle reason the 24 hour window was implemented. We discovered it was very difficult to follow the replies to a post if the darn post keeps changing. There's no way to know if a reply is about what we just read, or if it's about something that was there two days ago. And, of course, it makes it impossible for anyone to learn from the evolution of the poem.
If you make changes to a poem based on advice in the responses, that's great. But the best way to handle that is not to edit the original and lose that learning environment (for everyone, not just the author!), but rather to post the revised poem in a new thread.