I would agree with James Cherry - the Discussions are much like a forum, with browsing by “updated first” and replies in “oldest first” sequence, as replies can follow each other in context.

For something like site updates you could use Posts module and create new Post for each update. You can group them into a category, Group or Channel. Use category if it’s just for schema, use Group if you want to control privacy and use Channel (with pre-created label) if you want to post to a context that may have multiple  content types across the site.