Mods: they exist in Hearts of Iron IV. And some are quite good. Up to a point?
Navigation : grand strategy
Tanks, planes, spies, ships, civilian factories, focuses… Take command of everything and become a master of logistics and strategy. But mostly logistics.
What makes a « heavy » or « grand » strategy game player happy? Is it a thick rulebook? A pleathora of units? The historical accuracy? And what are the rules to create a « good » strategy game? Enthusiasts, gamers and developpers don’t always see eye to eye on the topic.