[Chris]

I don't know that I really want empty categories either, but ...

(a) I think I do want the ability to modify the categories. I could imagine a "By Friday" category or a "This weekend" category.

(b) One of the things I'm struggling with right now is knowing when a category is really empty, and when I've just set the filters (maybe accidentally, or because they're held over in switching from planning to context mode) so that it appears empty. Right now there's no real way to tell the difference between those two things, which makes me not trust what OF is showing me, which is at odds with GTD.