I just get my own bagels from the grocery store. Society relying on bagel up-sellers is largely a symptom of office life
My sandwich café sells sandwiches with such a variety of fillings that me trying to replicate that would lead to a lot of wasted food. Everything from asparagus, pickled carrots and smoked cheese to avocado, broccoli and burrata.
Plus, there is something about just going to a breakfast where you can just people-watch the passersby without food preparation or cleanup.