I have tried the "reader" part of many RSS apps, and to me it always sucks. If the original website is unreadable, I just don't subscribe to it. It if is nicely done, then the RSS reader usually makes it worse.
https://reinventedsoftware.com/feeder/
Literally, the only app I miss after leaving the Apple ecosystem.
The question I always have is how to keep a permanent archive of entries for long-running publication histories. You don't want the feed to grow without bounds, so paging (by time period or sliding windows of X entries) seems useful. Atom feeds have RFC 5005 links. I don't recall such for RSS 2.0, but it wouldn't be that hard to extend, I guess.
The nice part was that the bit that was mine was just a single static file.
The awkward part was the URLs looked crappy.
Browsers never should have thrown the spec in the dumpster. They should have kept up to date and shipped XSLT 3
(To be clear, I didn’t create Sourcefeed.)
Have a website.