I completely agree that in a big-picture historical sense that was unprecedented for its time and there may never be such a widescale and total destruction of so many cities again, but those kinds of things (mass killing in warfare, expansion of power over land, pillaging of cities) were not particularly new or unprecedented to the humans who experienced them and as they ultimately unfolded over a relatively much longer period of time than things occur in the modern age.

Over the next few decades with the development of AI and post-scarcity, we will experience things we literally could not have imagined, and these changes will come at an unprecedented rate. We will interact with things that push the boundaries of existence and completely flip long-understood economic and societal principles on their head.