I hear it all the time. People think cause new bows create so much energy they need much stiffer arrows. The fact is that most new bows have much smoother draw cycles than before. In the old days draw cycles on high energy bows was quite harsh. In arrow dynamics the energy transfered to an arrow is a very touchy situation. Even if a bow has much more energy dosent mean it has to shoot a much stiffer arrow. Spine is MUCH more relevant to how that energy is transfered to the arrow. The smoother the draw cycle is realevent to how that energy is applied to the arrow. The smoother the force is applied the softer the arrow you can shoot.