Indeed, Hearts of Iron series are in great part about managing your country's war production and supplies (including getting enough raw materials), setting up what hardware your military units are made up of and making sure they are well supplied. Actually moving them around and achieving your tactical and strategic goals is just a cherry on top.
Other Paradox games mostly just have generic "available manpower" number and unit attrition that eats into it, depending on terrain, weather, etc. They do not concern themselves much about how that manpower actually gets to the unit (which could be on the other side of the planet) to replenish it.
Other Paradox games mostly just have generic "available manpower" number and unit attrition that eats into it, depending on terrain, weather, etc. They do not concern themselves much about how that manpower actually gets to the unit (which could be on the other side of the planet) to replenish it.