While the average whitetail is oft-times thought of as "big game", compared to elk, moose or the great bears it is more a "medium sized" game. Any decent sharp broadhead-tipped arrow shot from a 40# trad bow is capable of a pass-thru at typical trad yardages (12-20 yards) if bone is not encountered. There has been a lot of misconception spread about by modern archery equipment manufacturers about what is necessary to take a whitetail but let's remember many of those guys are shooting ultralight carbon arrows with expandable points at distances up to 60 yards...this is not the fault of the manufacturers, but rather, the fault of trad shooters trying to apply high-tech logic to trad hunting equipment and distances.
I don't and won't blame Ashby's findings for people not doing their homework on the type of game, equipment and distances they are actually hunting with.