A big part of war is morale. People have to want to send their 20 year old children to die in a foreign country. No war happens without support from the people fighting it. But what happens to war when that's not a thing anymore? What will happen when we just have a bunch of robots killing each other? Nobody will have any personal reason to protest or speak out against a war. It's the ultimate abstraction.

You could call this a good thing or a bad thing, but I'm not smart enough to figure out which side is more likely to be true.