RSS is just one element of the ecosystem - the input.

I envision that the filtering mechanism CAN use any rules - hand-written, heuristics, old-school machine learning, LLMs. Just with a key difference - you are the one controlling it. No hidden tricks to make you "engaged" (read: addicted) or "sold".

If you feel it is too much politics, you reduce it. If too little - add. If you want less clickbaits and intellectual fast food, you filter it. Etc, etc.