A robotics company is programming an autonomous delivery robot for use on busy city sidewalks. They are debating between two primary operational directives.

Directive A: 'Prioritize delivery speed and efficiency, navigating around obstacles as quickly as possible without causing physical collisions.'

Directive B: 'Prioritize pedestrian comfort and predictability, maintaining a slow, steady pace and yielding a wide berth to all pedestrians, even if it significantly delays deliveries.'

Critically evaluate both directives. Discuss the potential unintended negative consequences of strictly following each one in a complex human environment. Conclude by arguing which directive, or a potential synthesis of the two, would better ensure the robot interacts with its environment in a safe and predictable manner from a human perspective.