Is there a specific reason? I think we can implement it right away. You can check the edit history and even propose edits! https://cdn.satellite.earth/ae66153e87be975d8eeee7f1934f3f8963eb8b4ec720df3896298be44f1112d1.mp4
People think 'to replace' when they hear/see edit, and that's where people on Nostr are think 'lol no'. But if it's a new post that gets added on top of the OP, and repeats as we see it's history, and replies being attached to whoever version they replied to, is fine imo.