Sure they still work and will continue to work but let's be honest it's a super niche technology and it didn't survive/flourish because it was flawed and fundamentally nerdy option people stopped caring about.
Supporting RSS takes the bare minimum of effort. Yet even in 2013 (aka a decade ago) RSS was declining in usage before Reader was killed.
I support open platforms but RSS had a super noise-to-signal UX and I personally don't miss it.
Google didn't kill RSS, they killed the best RSS product at the time and accelerated a dying protocol that would still be only used by HN's demographic and little else.
Using NetNewsWire and subscribing to subreddits with NNW on one half of my iPad and the Reddit app on the other half is still a great experience for instance.
I click on the date on NNW and the post opens in the Reddit app.
HN also has an RSS feed.
If it is a niche technology it will fall out from requirements docs and from CMS implementations.
One can already see that many news sites only provide headlines, not even teasers in the feed and different site generator based blogs (using Hugo and such) forget to create feeds as well.
My feed reader still provides value to me, but I regularly stumble over sites providing interesting content irregularly but no feed. (For irregularly posting blogs it is especially important as manually checking is annoying)
DaringFireball and a few other blogs get around this by having native ads as an RSS entry.
The problem is that nothing arose that adequately replaces it.
I was actually just looking for RSS feeds for some of the top news sites, and a lot of them have specialized RSS feeds for a certain category but not for the entire site. (I had to eventually settle for Newsweek)
I genuinely don't know, so this is an honest question. Nowadays, outside of podcast feeds, what's the incentive for media outlets to provide RSS feeds? Isn't it just a fringe assortment of techies still using it? (To be clear, I'm part of that fringe.)