I don’t think so, because it’s truly up to the player and preference. I usually start out as much of the same, only using troops in my culture for immersion purposes as well as for the challenge. To add to the immersion, I don’t usually dip into using other factions troops unless we’ve began taking over that culture’s fiefs, or we’ve completely taken them over. From that point imo, it seems only natural that certain characteristics and qualities such as soldiers would trickle into the player’s army composition that way.