Today's world have people working for 8 hours a day (minimum) / 5 days a week while making little to no progress on their overall livelihood, and at the same time people (read - the privileged) have more "consumables" yet no one is ever truly happy anymore, resulting in insane concentrations of wealth and power in the hands of a few.

Also, the past isn't just defined by slavery. There are plenty of examples we can learn from the people before us.