We are now in a regime where the same “free from sesame” products exist, and all other products must contain sesame.
It’s not clear that this has increased or will increase the number of products free from sesame. It is clear that it has increased the number of products with sesame and the amount of sesame. It sounds like we would prefer a regime where fewer products have sesame.
Assign whatever merit or import you want to the issue of sesame in food, but it is not at all clear that this new regime is actually better for anyone.