This looks very nice. Me, I would rather need a read-only twitter client. I'd like to be informed about Dionne Warwick and the occasional new cogsci paper without periodically making a fool of myself.
If there are sources that they don't support, you can host your own rsshub instance or use the default.
Happy to help you get this set up.
But for a comprehensive, all sources in one app, I'd want even more than categorization. I'd want different reading modes (concatenate tweets, leave other articles alone), maybe an expose-like overview to quickly filter, some intelligent ranking etc.
rsshub seems interesting though. Can it do hackernews user's posts?