I agree the future AI economy will make more high-quality decisions per unit of time, in total, than the current human economy. But the "total rate of high quality decisions per unit of time" increased in the past with economic growth too, largely because of population growth. I don't fully see the distinction you're pointing to.

To be clear, I also agree AIs in the future will be smarter than us individually. But if that's all you're claiming, I still don't see why we should expect wars to happen more frequently as we get individually smarter.