[deepnotderp]

1. Autonomy in the air is far easier than on the roads

2. Helicopters have a much lower L/D ratio in forward flight than the tiltrotors being proposed for eVTOLs.

[tsimionescu]

1. Yes, but autonomy in a fixed tunnel would be easier still, and yet the Vegas Loop is using human drivers.

2. Helicopters have the advantage of actually existing in many varied form factors and designs, in common civil use, unlike tiltrotors.