I'm not pushing the matter as there are, I recognise, other reasons for including the ones that are not required, just curious about the thinking. On this point alone of avoiding the "what's required" question , doesn't a single box for your handicap, labelled Course Handicap, better avoid it by indicating the one and only figure to be entered? There are, after all, six different ways in which you can order three numbers in three boxes, only one of which is correct.
Just asking, as they say.