I could not agree more. Relying on just one or the other does not give the archer an accurate picture of the entire function and characteristics of the arrow.

That I do not agree with. KE must also be considered when looking at the "entire package". What good is a heavy arrow that travels at a relatively slow speed if the archer is not very good at judging distance? A moderate level of both is usually the best option when applied to the game most commonly hunted with a bow in North America today.