Just like longer bows are more forgiving to shoot, I feel longer arrows are more forgiving, too.
I used to shorten my arrows as much as possible, fiddling with tuning them over and over. Then I ended up with a dozen shafts that were too heavy for me to shorten them....and suddenly was shooting much better groups. Maybe they are mnot more forgiving, maybe I am subconsciously using the extra length as my mind is aiming the shot. Or maybe they are so long they are already closer to the target while still on the bow.
Who cares, I like the results.
Your mileage may vary, offer void in Massachussets, tax/title/license not included, brush after every meal, always serve chilled.