Arrow Flynn, you are correct, tapered does not make me a better shooter; only I can do that. Tapered does however, make MY arrows fly better. I've shot enuf of both to know.
Parallel shafts can without a doubt make excellent arrows. The difference isn't great, but 25 years of shooting wood has shown me that there is a difference. Tapered arrows go back at least as far as the Turks and have been "discovered" by several different archery cultures. If there was no advantage to tapered arrows, man would not have invested so much effort into them. JMHO