I remember my other example now...

Unit pool recruitment-

Like I mentioned in another thread, some factions have multiple units of basically the same type and quality. While some probably view this as an oversight by the designers who rushed a game out the door, I see this as adding particular emphasis for certain units with different factions. For example, the french have "clones" of high level cavalry, but this just means that the french can, on the spot, recruit huge armies of heavy cavalry as where Germany would not be able to do the same with the same level of quality to their cavalry.