Comment by nradov

One large rotor is obviously more efficient than multiple smaller rotors. Where e-VTOL aircraft at least have the potential to win for certain missions is more with cost and availability. Helicopters are extremely expensive and require constant maintenance, and tilt rotors like the V-22 are even worse. But an e-VTOL could potentially eliminate transmissions, clutches, drive shafts, swashplates, etc. Long term we'll see a mix of both technologies being used.

As for survivability, we'll see. Any significant damage to the rotor systems will send most helicopters straight into the ground.