I imagine that given the low resolution, 3D would have been much harder to understand (identify) for most viewers. Unless you happened to be facing the "front"

I imagine that given the low resolution, 3D would have been much harder to understand (identify) for most viewers. Unless you happened to be facing the "front" of the 3D representation, it would probably just look like a bunch of sparse dots. As for the flight duration, they probably have larger/more batteries than consumer drones since they should be purpose made (carry self, more batteries, light+electronics (small/light), communication electronics (small/light)).