You are right about that but I think if the interface had clearly defined groups like Reddit, which were moderated like Reddit or Facebook, where only people in that group selected as moderators can determine for example to allow a post into that topic, then maybe you can focus the curation per topic.
Right now if I check the basic income topic I can't find anything related to basic income without digging through all sorts of noise.
RE: Improving Steem’s rankings to cater to diverse content preferences