Because AI isn't reliable enough to stay on task until lunch time. Which would also be twice as long as the batteries last.

Even a marine has a magnitude greater mental capacity, and even more energy density.

Without getting into the shortcomings of AI or the dangers of autonomous weapons platforms: it's cheaper to send in the meatbags

Personally, I believe a country that's most likely to embrace this technology would be one whose economy is stimulated by wars of aggression: therefore cost matters much more than trivial details like casualty figures and operator safety

Russian war casualties just reached 1.5 million. Think of the price of a robot able to traverse a wildness and flight...then multiply it times 1.5 million.

People are cheap to some/most leaders.

That's probably about the direction some of these companies are heading towards.

I mean, you look at those VR treadmills and those Atlas robots, then you can easily see how a human could fully control a robotic avatar on the battlefield now the humanoid robotics of Boston Dynamics and Co are pushing that frontier.

Because the point of battle is bloodshed, not digital sport contests.

How would you keep score if no-one is getting killed?