eli5: There are labels on certain products saying “x product was produced in the same factory as y product” where y product contains an allergen. Why does it matter that both products were made in the same factory?
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Even with the best of cleaning and air filtration there’s a chance an allergen can make it form one production line to the next. Also not all production lines need to be cleaned to within an inch of their life between every run so it’s possible some trace amounts of allergen will remain in the production line even if that specific product doesn’t have it as an ingredient.
It’s one of those better to be safe than sorry kinds of things.
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