Yeah, believe me - we wanted to keep the Yuezhi. We had done a fair amount of work on them already, but while we at first thought they were present in the edge of our map, further investigation (admittedly the sources for this period and this area are not very clear) convinced us that they just were not on the edge of the map yet. So we moved to another nearby faction that was, a group of the Sakai. We also have a very different system set up for the nomads in our next release too though, so playing as either of our two nomadic factions should be quite a different experience.