If it says “may contain” then I’m fine. If it’s listed as an ingredient then I can’t risk having it.
For people who can’t have any at all you’ve not improved the situation but at the cost of making it significantly worse for people with a mild reaction.
The FDA should either allow "may contains" labels to be used, or create a new category that can be used.
> Because it can be difficult and expensive to keep sesame in one part of a baking plant out of another, some companies began adding small amounts of sesame to products that didn't previously contain the ingredient to avoid liability and cost.
So yes, to avoid having to prevent cross-contamination, they started intentionally introducing trace amounts of allergens.
Produce an item, clean your utensils before the next time. Minimal cross-contamination issues.
A production line processing sesame will create a certain amount of sesame dust. Ensuring that dust gets nowhere near other production equipment is expensive.