Comment by edanm

You're comparing very different things.

One thing is not having shrimp and crab in a kitchen that doesn't cook seafood.

Quite another is not having sesame at a bakery. Sesame is an incredibly common ingredient in most types of breads. I doubt there are many bakeries, whether "factory" bakeries or just corner bakeries, that don't have some bread with sesame, because of how popular it is.

So their choice is either to get rid of sesame entirely, or have to declare it on everything.