I agree with Mezzo that thresholds shouldn't be the defining factor but shared facility or shared equipment.

I have had anaphylaxis from simply walking into a supermarket past the bakery (likely airborne wheat). Also a severe reaction to people eating or cooking my allergens nearby. I don't believe that 'standard' thresholds truly exist.

Also, what happens if you eat four servings of a food that is below threshold and it brings your dose above threshold? How is that not a concern?

2 mg of peanut to get a may contain label seems way too high. I'm all for standardizing but we try for - if it's in the same manufacturing equipment, it's may contain. I don't know how much DD can have but it's TINY if any at all. She has reacted to probably a washed fork or plate. Not strongly but still.

This would be such a game changer. And yes to people dealing with allergies being involved. I mean, allergists regularly say peanut oil is fine—yet I've seen my kid react to it several times.