While these are valid points, I don't think you should be tiptoeing around the importance of symbolism part that cavalierly. Symbolism is a
massive part of national identity and monarchs whose reigns have been iconic are a massive part of their legacy, regardless of whether their actual power has been curtailed by the government or not.
People in their home nations identify with them.
This is why Wilhelmina and Gandhi are
important (and in Wilhelmina's case, popular) choices as leaders (although the devs completely ruin Gandhi by meme'ing him into oblivion, but that's a completely different story.) They may not have held much power, but they indisputably helped set the stage of what it means to be a Dutchman/Indian in the present day through the sheer force of
personality. The same, I'm sure, can be said of Victoria.
Cathérine de Medici... not so much.