Maybe sort of off topic, but it seems like activity pub could provide the same functionality (and maybe more) as RSS.

If a news site or anything else that posts stuff periodically supported the activitypub protocol, anyone could subscribe to it, just like rss. Then when anything is posted you’d see it in your feed.

With activitypub (and not rss) you could comment on it and see other peoples comments, and crosspost it elsewhere.