Arrow flight is only one part of the equation, but a critical one. I have a few examples...

Several years ago (when I was a good bit younger, stronger, and dumber) I went bowfishing one night with a bow I was pulling around 125# on (it was 98@28, and I bottomed out a bowfishing arrow at full draw). Got tons of shots, but couldn't get a fish for love nor money, and didn't understand why--my arrows seemed to be hitting the spot. Got a shot well into the light, and saw the problem--my arrows were so underspined that they hit at an angle. Even though the shot was true, as soon as it hit the water it shot off in a different direction.

A few years ago, I was shooting an aireal novelty. The club had limited space, so the thrower only launched the targets maybe 8-10 feet high with backstop netting to stop any arrow that missed. I was shooting 66#, arrows weighed in at around 625-640 grains. I thought my flight was pretty good...actually it was pretty good, but not perfect. Along comes Rod Jenkins shooting a bow in the mid to low 40's. He missed, and his arrow actually went through the netting--reason being was because his gear was tuned so well, and his release was so good, that he was out-penetrating a set-up that was 20+ lbs heavier!

Made a believer out of me.......