Yeah, it would be best if new topics were always started with the implied responsibility of the topic author to curate the original post. Under some special circumstances (original author gone/disinterested/etc) the post could be wikified. But, just to be clear, does Discourse lose the concurrent edits, or just save them as older versions, like most wikis do? If it’s the latter one, I don’t see it as a huge problem. If making a longer edit, just put a notice up top or something.