You're free to develop an RSS reader with those features yourself. RSS is - on paper - an extremely simple protocol, but since many feeds are broken (not wellformed/improperly escaped XML, often incompetently copied from HTML, with spam, etc. etc.), RSS readers must integrate individual feeds almost on a case-by-case basis, with feed-specific fixes and heuristics. And there goes your project budget. Considering RSS isn't exactly growing (because the number of valuable news site isn't neither), the state of RSS is as good or bad as it always has been. I don't know if that is actually a good thing, because when big media (Google) last turned their eye towards it, it monopolized and almost ruined it.