Autorotation depends on rotor inertia and rotor pitch control. These companies don't do pitch control because if they could, they'd build a helicopter or an Os

Autorotation depends on rotor inertia and rotor pitch control. These companies don't do pitch control because if they could, they'd build a helicopter or an Osprey analog, and fixed pitch rotors must be low inertia to slew thrust quickly. So no autorotation.