Answer:
It is difficult to predict exactly how life would be different if there were never empires in world history, as their impact has been so profound and far-reaching. However, we can make some educated guesses based on what we know about the role of empires in shaping human history.
Without empires, there would likely have been less conflict and war, as many wars throughout history have been fought over territory and resources that empires sought to control. This could have led to a more peaceful and stable world, although it is also possible that other factors would have led to conflict.
Without empires, there would also be less cultural exchange and diffusion, as empires have often served as conduits for the spread of ideas, technologies, and cultural practices between different regions. This could have led to a more isolated and insular world, although again, other factors could have encouraged cultural exchange and diffusion.
Without empires, it is possible that more decentralized forms of governance would have emerged, such as city-states or confederations of smaller polities. This could have led to a more diverse and heterogeneous world, with more localized identities and cultures. However, it is also possible that larger-scale political organizations would have emerged through other means.
Ultimately, it is impossible to say for sure how the absence of empires would have shaped human history, as it is such a fundamental part of our past. However, it is interesting to consider how different the world might be if empires had never existed.
Though, what I can say. Life in the Imperium of Mankind would be hell.