alt Hacker News>What good are drones, except as weapons of assassination? Can't use them in an conventional war, there are shields.
Presumably a drone could get close enough to push a blade through the shield (maybe use a rocket booster or some other advanced "suspensor" tech) at low-ish speed (a knife would have to travel through the shield on the order of a human reaction time, otherwise even knives wouldn't work. That's about 0.1s/0.1 m, so 1 m/s - ish.)
if it moves slow enough to pass a shield, it moves slow enough to be easily dispatched. And remember, no autonomous behaviour, there has to be human operator. And it's very expensive. It just doesn't scale.