Well most of the units in the factions I mentioned use generic stats that are shared by most of the minor factions, that's true. But several of them simply have more units than others. Almost all of the minor factions lack guards, most lack light infantry and heavy cav, basic essentials for a balanced army. The one's I listed are ones that have most of the bases covered as opposed to the extremely skimpy factions, even though the unit stats are generic.
And then there's the Kingdom of Italy, which has 4 completely unique units: Velite Grenadiers, Guards of Honour heavy cavalry, Guard Foot Artillery, and Guard Horse Artillery.
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