Striving to make our chosen equipment (in our case, it happens to be traditional archery gear) as deadly and efficient as possible is our responsibility.
I haven't used Dr. Ashby's techniques but plan to give them a try. I like his idea that his techniques really shine on the marginal hits, especially where bone is encountered. And I know that not one person on this website can claim to have always made perfect hits on game.
I look at his work like this: automobile manufacturers have a research and development department that strives to make trucks better. But at the end of the day a truck still has four wheels, a bed, a cab, an engine, etc. I consider Dr. Ashby the research and development department for trad archery. Do his findings mean that the way we have always done it don't work or are somehow lesser? Not a bit. He is just sharing his findings and showing us ANOTHER WAY to do things. Take them or leave them. It's your choice. But they still involve a trad bow, arrow and broadhead. I just don't understand why some people get all worked up about his proposals, as if they are an affront to the traditional ways we are used to.
One more thing...how did the single bevel broadhead get a reputation as hard to sharpen? I have a number of knives with a single bevel edge (Emerson, CRKT, etc. with a tanto style blade) and they are the absolute easiest knives I own to sharpen to a scary edge. Simply work them on a file or stone at the right angle, then flip them over and knock off the wire edge on a strop. Done. No counting strokes per side, no switching from side to side and having to reset the angle. I did the same to a Zwickey I had lying around and found it a piece of cake to turn into a single bevel that is razor sharp. Just my two cents on all this.