There are several Factorio dependency trackers and calculators already. Importantly, there are several mods that make the vanilla game's graph look like child's play.
The real innovation was just teased at the end. Balancers (systems of belts and splitters than evenly distribute the contents of n belts to m belts) are tricky to get right and compact and so far as I know are only human-designed. A mechanism to automatically design them would be very interesting.
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