Indeed, this works fine for pages which just contain CSS for that specific page but I'm not sure how often that actually occurs in the wild. And if you've got just a one page site then surely managing the CSS for that isn't a big issue?

For most of the sites I've worked on, I bundle up the CSS into a main stylesheet and then often one specific stylesheet per-section. If this could spider the whole site and generate a report on that then it would certainly be more useful.