Stayed at Delta with a breakfast package, was told by front desk a la cart is covered too, for my celiac wife. Every server fought to shove the buffet at us. 2 of them even said the buffet is the only option for the prepaid breakfast. They may be better for lunches or the rooftop bar, but we were so put off we never considered them.
The majority of foods were either Starbucks or grocery store bought (boxes of cereal, oikos individual yogurts, tazo teas, rainforest blend coffee).
Not what you expect for a restaurant attached to a 4 star hotel at all.