Maybe the issue there might be that if every unit of a certain thing has a shelf life, you can't just treat the item as a count. Each item becomes unique and s

Maybe the issue there might be that if every unit of a certain thing has a shelf life, you can't just treat the item as a count. Each item becomes unique and so you have to track each one's state as well as define rules about the shelf life. Like, what happens to its shelf life while in a train? Can the items at slightly different points in their shelf life be stacked? etc Of course it's a solvable thing, but it maybe that would be too heavy on the game when scaling up to large factories.