Making a modern-age wargame in the vein of Europa Universalis or Hearts of Iron has one teensy little problem:
Nukes.
They're interesting in a lot of situations, yes. Particularly in games like DEFCON where there's little point in doing anything else but nuking your enemies over and over again, or in simulationist games that try to realistically portray the tensions of Cold War. But for games where one tries to increase and maintain their influence, nukes sound like a frustrating ass-pull weapon that can devastate you without any practical defense. It's just not fun. Theoretically one could limit the use of nukes using some sort of tension meter ("no one can fire their nukes until we're THIS close to WWIII") but that sounds like EU4 Aggressive Expansion except nukes instead of coalitions, and everyone knows how beloved that mechanic is.