A very low inertia rotor head requires a quick response time should there be a loss of engine power....thus the closer the hand to the collective the better.
A high inertia rotor system is far more forgiving in that regard thus more time to get the Lever down than in a Low Inertia Rotor system.
Some aircraft can develop a vertical oscillation if the collective friction is too loose with a hand on the Collective.
Ever watch a Crane Operator and how they manipulate the controls ....and keep their hands on the controls of the crane?