The issue is if they started "taking the package" ie the Unique Abilities, Civics, Infrastructure.. that creates a Fantasy Roman Civ... same as if they take the Inca or they unlock the Ming... you are essentially creating an alhistoryRome (or an althistory Inca/Ming depending on how you think of it)... as opposed to just getting some unitsActually, the Roman Empire without any move to a 'steppe' environment absorbed quite a few Steppe Peoples' military techniques. If you look at the Roman Army units identified in the Notitia Dignitorum you will find several Auxiliary units labeled Sagitarii Equites Hunorum and Lanciarii Equites Sarmatii - Hun Horse Archers and Sarmatian Mounted Lancers (who are depicted as Cataphractoi - armored men on armored horses with long, heavy lances) respectively.
These units were stationed all across the Empire, including at least one unit of each in Britain, so the Steppe cavalry techniques were quite familiar to the Roman Empire - at least to the people who mattered in forming military units and armies.
This, of course, does not mean the basic culture/society of either the Roman or Byzantine became Steppe Pastoral in any meaningful sense, but it does mean that in game terms they could field very Steppe Pastoral-looking military forces without taking on the rest of the Steppe Pastoral package.
At the other end of Eurasia, the Mongols had siege equipment built and manned by Persian and Chinese experts beore they ever conquered either state, including advanced gunpowder weapons (bombs and grenades rather than 'gonnes') and trebuchets. This in no way turned the Mongols into either Persians or Chinese, but it shows that there is, perhaps, more flexibility in military techniques than presupposed in the game.
This, frankly, is one reason that I hope Civ VII includes a 'Mercenary mechanic' similar to what Civ VI's Barbarian Clans mode had where you can 'hire' military units from minor States/Settlements/Peoples. Ideally that would include some of the Unique Units only available from non-city-based peoples like the Huns, Sarmatians, etc.
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