A 25 Torx bit is 25 What???

These are actually a very advanced design. The offset in the head configuration is designed to maximize torque load in each direction. Going in, the torque load peaks at the sharply at the end when the fastener hits home. Upon removal, the torque is at it peak when the fastener is first being removed and diminishes rapidly after that as the bolt comes out. The difference in design clockwise vs. counter clockwise is based on the torque application curve to provide the best contact and transfer of energy possible.