source -- image shows Volocopter's design
I find that in the designs of aerial taxis, particularly in Volocopter's design, the design consists of a system of multirotors.
WhichWhat is the main reason for not substituting this bunch of rotors with fewer bigger blades (helicopter)? As far as I know, a helicopter is energy efficient for horizontal displacement, and the multirotor is at hovering. Does a quadrotor taxi provide any other dynamics advantage?