No problem with longer arrows on the target range, but it's amazing what an arrow three inches longer than it needs to be catches on when hunting. Creates more movement in nocking an arrow. The arrows stick out more from a bow quiver, back quiver, just about any quiver and catch on/brush against more brush making more noise. In a bow quiver, the nocks usually rest dig into the ground and get filled with dirt if you lean your strung bow against a tree, etc.
I realize that a lot of carbon shooters leave their arrows longer to achieve the proper tune. However, it would seem they could drop down in spine a bit (i.e. buy different shafts with greater deflection) and shorten the arrows to about one inch behind the point.