Hearts of Iron IV
For HOI4 we changed the supply flow system to be instant and based around bottlenecks instead. The goal being that it should be easily apparent what is causing your frontline problems. We also moved to larger areas to get a better manage the complexity for calculations and display to player.
What I would love to see in a supply system, is the dynamic of having to halt an advance to allow supply to catch up. This would require each supply region to have a supply stockpile with can be depleted, and for units to use drastically more supplies when in combat than out of. Is this something you could implement in the future?
Right now, supply problems are most easily solved by advancing to spread your units out over more regions.
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