Other than being a generally well-designed feed reader, my favorite feature is that you can configure it - on a feed by feed basis - to render the post website itself (which it trims down to the specific post), rather than the snippet - so with (at most) one click per subscribed feed, I read all the articles inside my feed reader, whether the RSS feed contains an entire article or just a snippet + "click here for more".
Killer feature for me is the ability to group your feeds then making them availale via separate rss channels.
The mobile client is also pretty damn good.
It's also open source for those that want to try to directly contribute code fixes/ideas, but I've rarely felt that need. I'm happy enough just paying the Premium subscription every year and knowing that suggestions on the forums (used to be UserVoice, now is Discourse) get responses pretty quick.
Also, link deduplication, because sometimes articles from the e.g. the CNN Politics RSS overlap with the CNN US RSS
I still wish there is an RSS Reader within Safari. Since all my bookmarks are synced to iCloud, there is no reason why my list of RSS feeds can't live within my iCloud as well.
(I rewrote rss2email in golang.)
It means I don't need yet-another application/client and I can do sorting, tagging, etc as I would for emails. Doesn't matter which host I'm on, or where I am, the state of "new" vs "read" is maintained, for example.
It is not open source but I haven't managed to find any negative comments on the developer.
I don't have enough feeds to need their pro tier.
I am probably going to write my own soon for practice.
Created a slack for myself and do all kinds of integrations. Including several rss channels.
It is a sad state of affairs and I share the sentiment that seems to be dripping from this short post.
So much has been broken. So much has been watered down or simply blown away by flashy blinky adsy stuff. Sigh.