The Baktrian HA is not a lancer. It's a melee medium cav combined with archer ability. Also, it has ridiculous amounts of armour for a horse archer unit. It's one of those more outlandish units, take-it-or-leave-it sort of unit. As for Indian Longbowmen, they probably have 10m less range than Caucasians due to their bow type. Their increased cost is similarly probably due to their melee weapon. I've seen them used cleverly by players as AP melee units, same with Numidian archers.

If the Ktistai indeed were an encouragement to their fellow compatriots, why weren't Hetairoi and Kataphraktoi the same for Hellenes and "Easterners"? Creme de la creme elites would all have that similar psychological role, but you don't see eagles on all such units...what's the correct compromise? I'm not sure.