Jesse lots of us have a different way of thinking about that. I am thinking one arrow in the spot I wanted to put it is also a pretty good measure of accuracy.
One arrow shooting between trees while bending way over to get under the branches and leaves yet still get to the target, and hitting it where you were wanting to, is a good measure of accuracy.
Three arrows or twelve arrows shows repeatability, but I typically only get to shoot one anyway.
Just another point of view.
ChuckC