I'm currently on the hunt for an RSS reader that has good filtering and sorting functionality, so I can (for instance) pull several feeds from only certain sources, but not see any posts/articles about terms A or B, yet see and sort any posts with term C by time, followed by either posts from source 1 with terms C and D, or posts from source 2 with terms E or F but not G, which would be sorted by relevance.
I know that's a complicated and probably poorly written explanation; but I'm imagining something like Apple Mail Rules for RSS.
Because not every site has a RSS feed. For example when Claude Sonnet 4.5 released it would make sense to have that, but there is no RSS feed for Anthropic. Being compatible with the entire web instead of just a subset of it is useful.