Don't worry, I didn't take it in a bad way. And I do, actually, completely agree with you; I thought that my comment made that clear -- but I do appreciate you making sure I didn't take offense; that kind of courtesy is rare.
Back to our issue, though: if, tomorrow, browsers all got good enough at user-css that Readable wouldn't be needed anymore, I would gladly convert it into a one-page tutorial explaining to people how to set up their user-css :)