That's a client side question, IMHO. If you want your client to show you replies, then you configure it with a crawler that scans other RSS feeds for posts that

That's a client side question, IMHO. If you want your client to show you replies, then you configure it with a crawler that scans other RSS feeds for posts that reference the post you are interested in. Content moderation is thus all user based due to who the user decides to follow and what crawler(s) they choose to use to find related posts in feeds they aren't directly following.