The more weight that is spinning, the more the torquing affect to the plane.
Engines with heavy flywheel/fan magnetos, heavy props, spinners, hubs and heavy nuts have large rotating mass.
Remember the old WWI radials that spun the case and all the jugs with the prop, and the crank was stationary?!!
All the energy to spin this weight up to speed is transfered to the plane with every movement of the throttle.
If this weight is kept to a minimum, you will have excellent throttle response and less torquing.

Kirk