https://www.defensenews.com/unmanned/2023/08/03/artificial-i...
https://www.forbes.com/sites/davidhambling/2023/10/17/ukrain...
https://en.m.wikipedia.org/wiki/Kill_chain
The thing that does the killing in a military is just a tiny part of the total functionality. As you say it doesn't need to be that smart. Picking the targets and figuring out what is going on without your enemies knowing they are being watched is the much larger part of the kill chain. There is ample room for AGI here.
but intelligence is much more important than weapons. you can make sure they don't get away or turn the weapons against you if you can outsmart them. also you can kill the people you intend to kill, instead of somebody else, which is fundamental if you have objectives other than racking up a high body count. finally, intelligence is how you make weapons in the first place
but i think there are other, possibly larger risks that result from strong ai in weapons, and plausible incentives to put it there