Originally Posted by
gsa103
The higher torque value compresses the cogs together so they move as a unit. Mainly it help prevent gouging of aluminum freehubs by steel cassettes.
Geniuine Shimano freehub bodies are either steel or titanium* and will not get gouged from lower torque. Cheap knockoff aluminum bodies, you're on your own. In my experience they will get gouged no matter how tight you get the lockring.
*They made an aluminum Dura Ace freehub but it had taller splines to prevent gouging.