I've been thinking a lot about LLMs for RSS categorization. The long tail of feeds have interesting content but rarely tag posts with categories. Planets (like https://planet.ubuntu.com/) are good for finding feeds that post about a certain topic, but without per-post-category metadata, you get off topic stuff mixed in.
There are deeper challenges too, like lack of consistent taxonomy/topic naming, which makes things messy even when categories are present.
I still believe you're better off curating your own feed instead of delegating to AI, but I'm curious to see how Kite evolves.
I'm experimenting with these ideas at https://alexsci.com/rss-blogroll-network/ and https://alexsci.com/blog/rss-categories/ . I hope to publish some more recent ideas soon.