Seems to me this would be talking about epitomes and summaries vs full lectures and books, e.g., letter to Herodotus vs the books of On Nature.
Yes I'd say it "could," but if I were collecting maxims of the golden words of Epicurus I suspect I would have found one a little more useful about pleasure or death or the gods to include, and left that one out
Maybe, but I'd be interested to see how prevalent the practice of epitomes and summaries were in other contemporary philosophical schools. If other schools only advocated long discourses or long dialectical sessions, Epicurus would have to have defended the proposition that both long and short forms strive toward the same place.