Romanov is just a branch of Oldenburg that’s why they have Russian units. The Rurikid line ended before the 1600s and the Russian maps are already covered by Jagiellonian and Oldenburg houses.
Ideally, new royal houses should have several factors in their favour to justify their inclusion.
- Relevance
- How powerful were they?
- Did their rule last for a significant duration?
- Appropriate units to represent them
- Significant geographic distribution
- They have to appear commonly enough for players to get used to them (5+ maps)
- If the areas they ruled are already adequately covered they should be a lower priority
Given those criteria, I’d say you could maybe justify Medici and Nassau as additional royal houses. Ottomans would also fit the criteria, but I’d much rather a different type of settlement like Armenians or Kurds for those maps. You also have to keep in mind that there are already 9 royal houses which makes them massively overrepresented compared to other regions like Asia and Africa.
