I've played the first 5 or so hours of the Julii campaign without enslaving the populace, thinking that I would maintain higher populations and climb the tech tree faster. But, after taking some Greek cities I found that the only way to hold them and make them useful is to enslave the populations, reducing all kinds of city management issues, and gaining population in manageable cities. I was wondering if anyone else has come to the same conclusion, or or is it best just to occupy the settlement and focus on cultural and growth build policies?