Food allergies are a disability. Some people with food allergies cannot consume sesame.
If you're a baker selling bread where sesame is not an ingredient, slapping "this product may contain sesame on your entire product line" or deliberately introducing sesame seeds into your recipe means a large part of the grocery store is inaccessible to people with a sesame seed allergy.
I don't think that's equitable. Imagine if every company that didn't want to cater to people in wheelchairs only rented office space in historical buildings that couldn't have wheelchair ramps installed.