FPS does mean something outside of 3D. The faster the bow, the less margin for error when guessing the yardage on a kill shot.
I thought the reason for the lazer rangefinder was to totally eliminate guessing the yardage for a kill shot.
Using arrow speed as an excuse for taking a shot on a living creature where you don't KNOW the distance is inexcusable. If your yardage estimation skills aren't good enough for you to tell whether the deer is at 27 yards or 35 yards, then you use the rangefinder or you do not shoot. Period.
If most of your hunting shots are taken within 30 yards, the importance of arrow speed is WAY overblown. The trajectory difference between a 300 fps arrow and a 250 fps arrow is practically negligable at 30 yards. At 30 yards and under, QUIET is far more important than fast. And accuracy always is the prime consideration.