Yeah but in STW only the Daimo, not every family members or rather sons, had a retinue of heavy cavalry and the size, 11, was fix even if you changed the units' size in the options!

I just think that they stress out a lot more in STW, at least in the game manual lol (I haven't tested that out) about the relation between cohesion and morale and a little about units' strenghts. Some elitle units were almost unbeatable by lesser troops like some Hounds of Kornus or something like belonging to the Picts faction I think, in the north of the Britain Isles in BI (can't remember what it is) which I remember seeing one unit of them who simply charged through one of my unit of roman spermen standing on the wall, soldiers being send flying everywhere and the whole unit dead after that with only a few casualties inflicted to those monsters. Or having a elite unit standing perfectly still while archer units shoot volley after volley of flaming arrows on them and not a single one being killed

But Bovi you are right, the AI had less think to deal with or making use of, making it more effective at fighting battles and acting on the strategic map.