One of the largest and one of the most populous countries of Europe -- PolishLithuanian Commonwealth -- is currently represented by new-born Peterburg size Warsaw and ugly 3X3 rectangle.
Vilnius would make it actually to look like Polish
Lithuanian Commonwealth, not just Mazovia.
Russian AI will have more "tensions" along more borders and would feel stronger about Polish partitions.
German AI will still be stronger with 4 cities vs 2 Polish.
Baltic races are completely absent in DoC. But Europe was not about Romano-Germanic and Slavic nations only. Even Finno-Ugric people are represented by 2 cities, why can't we have one Baltic city?
Krakow, Lublin, Lvov -- they are all absent, no indication of Polish domination over the Western Ukraine, Silesia, Galicia. Map is too small and does not allow for more accurate representation of historical and cultural reality of 18 century Eastern Europe. At least one lovely Vilnius will make a statement, that -- look, Eastern Europe was not only about Russians and Germans, it was not about Orthodoxy vs Protestantism at all.
Antemurale Christianitatis, PolishLithuanian Commonwealth was declining, but still present in affairs of 18th century Europe, at least as a 2 cities civ!
(In that regard Orthodoxy should not be present in Warsaw, but instead Catholicism must be present in Kiev, which represents entire religiously and politically divided Ukraine).