Aside from the clickbait headline (hey, it worked on me) this seems cool...but I don't see myself using it. Why? I have a bunch of unread posts (either new or old) that I would lose by doing an export/import. Import would result in me only having the most recent posts from each feed. And I'd have to use this tool frequently to categorise new feeds? Painful. Unless I'm missing a way to import just the categories and keep all my existing posts and unread items? I use FreshRSS.