I was just about to add this as a suggestion, but lo: it's already here and already a thing!
The present example seems to filter on the basis of a set of topics, which is OK as far as it goes but there aren't very many of them, and I think that it would need to be able to be personalized, similar to the way kagi search allows you to disable feeds from particular sources. Being able to add topics (or choose from a larger list and then apply kagi-search filtering) would be important.
Multiple tabs or sections, so that your politics news wasn't bleeding into your tech or sport news?
I already lean heavily on RSS feeds for "news", so I would be looking for something that can cover the things that I don't want to follow specifically and currently rely on human-curated feeds for (news publishers of the traditional sort).
It doesn't appear that you've turned the handle on kagi-news.obrn.com since last October. Does that mean that the experiment is failing? Perhaps this feature might be a better fit for Feedly, my RSS reader of choice, which already knows my self-curated feeds and reading history?
Best of luck: all good so far.