The thread glosses over the "player builds everything" feature, but that's not the half of it: everything in your nation is open for your consideration: the buildings you construct; the food your people eat; the transport vehicles and fuel needed to run them - you can choose to set up supply chains all the way from extraction, to refinement, to manufacturing and export - or import the things (and manpower) you don't care about, at a cost.
Think "Rise of Industry" or OpenTTD meets Tropico, but you also need to source the resources and manpower to build your buildings, roads, and railways.
I also find the mod selection (namely a wide variety of buildings) to be quite an asset to the game