I get that, and it could make sense to archive things at some point, but I do think it was nice for certain communities, aside from things like sports, news, etc., to be able to still comment on old posts. Especially help posts or things like that, because they could still be relevant months or even years later.

There should be a way to unarchive something if that's the case, which works better than a new post which references the previous one with small addendums or questions. This is especially useful when people are searching for information on certain topics and everything is contained within one post rather than 5 posts because the earlier ones were archived. Many people will never continue searching and see all of the newer information once they have found the old now incomplete posts.