Buildings are mostly standard on every map and unfortunately the differences between countries are getting smaller. Ensuring map performance as recommended for the game is a brake here.
Perhaps TML-Studios will have to decide to increase the recommended PC hardware configuration in order to play smoothly, and this could result in significant differences by country.
More unique buildings at the cost of lower efficiency. Take Paris, for example, where the performance is much lower (less FPS).
If we want a better game, we need to have better hardware than in 2016 when the game was released.
Eventually, the introduction of pedestrians will also lower productivity. For this, you also need better computer hardware. If a map of Poland is created in the future, remember that there are completely different road markings and unique buildings.
The maps should look like this, that immediately after entering a given country, we immediately see the differences and feel the specific climate.