This is true, but there are a lot more hours available now than then. Global supply chains mean a modern "legion" can draw from the labor of 8 billion people. T

This is true, but there are a lot more hours available now than then. Global supply chains mean a modern "legion" can draw from the labor of 8 billion people. Those workers live longer lives, and far far fewer of them are working in agriculture just to keep themselves fed. This is before factoring in their productivity -- an hour of 2023 globalized labor is presumably many times more productive than an hour of 500 BCE Roman labor.