..Yeah, but Arthur, that 180 fps arrow will arc more than a rainbow.
Actually, Frank, they do. However that' s only a problem for someone that is enslaved by the sights on their bow. Those of us that are free from artificial aiming devices don' t even notice it.
Since we lightened the overall weight of the arrows we also greatly decreased the momentum that each arrow carries with it. So, in order to justify our choice of light arrows and their ability to continue to penetrate well with certain setups we have turned to using KE as a basis for comparison.
That' s an expansive version of exactly what I thought I said.
I don' t remember ever hearing anything about KE pertaining to archery at all until ICS carbons and overbuilt/overpriced bows. Overbuilt to keep them from blowing up in your face at 5 grains per pound.