There’s a new-ish feature in Discourse for a list of Unseen posts, posts that you haven’t yet seen. Near as I can tell, it’s kinda like the Latest listing, but it only shows threads with replies made after your join date.
Not sure how much utility it has here since many users’ join dates go back to the beginning of time, but maybe someone will find it useful. It can also be added by admin so that we can set it as our default landing page in our preferences, but you can always edit your bookmark.