I think the success of Europe Universalis is rather an "exception to the rule."
In the world of the gaming industry, the developer's place is very insignificant. He does what the top-managers say to him. The creation of games is aimed at making profit. Therefore, everything is determined by marketing, and studying the needs of the target audience. The unsuccessful (in my opinion) development of the series of the game "Civilization" went exactly for this reason. The owners of the brand took into account what gamers want to play. To maximize the "squeeze" money out of them, they went in the direction of maximizing the design and graphics, adding a huge number of unnecessary functions and "essences." For them, people pay money, it determines everything. The fact that these functions and "entities" in no way correspond to realism and accurate modeling of history - no one cares. The consumer likes it, then it will be so. )
Therefore, I never wanted to deal with the modern gaming industry. When you make scenarios in Civilization II, you do them only as you want. "Free artists". I doubt that when you monetize your hobby, everything will be the same. )
Perhaps in the Paradox studio, it's all a bit different. Since their games Europe Universalis, Crusader Kings, and their clones - are really gorgeous.