To me the biggest concern with AI weapons is not cyberwarfare (which has been QUITE underwhelming so far despite all the theoretical potential), nor even the potential loss of control over AI weapon systems.

What worries me the most are the economics of AI based warfare: How long would it have taken, in retrospect, for the US to get out of Vietnam if no price in American blood had been due at any point?

The potential to violently reign over a population (no longer need to recruit police/soldiers FROM that population to enforce your rule!) is really concerning, too.