The value of 'free' breakfast might be of greater or lesser value depending on who you're traveling with? We very recently stayed in a large NYC Hilton 'combo' hotel (2 of their brands in one building; one a little more upscale/targeted to couples than the other) that was very busy with a diverse clientele; many guests from other countries, families, couples; some sizable traveling high-school groups, etc.
Breakfast was included with all rooms, and while we booked the hotel for other reasons, that breakfast was clearly a bonus for families with older children and those school groups. The amount of food I saw those young persons put away every morning was impressive, especially the boys! A considerable amount of fresh fruit, muffins and bagels also walked out the door (a no-no in the RS world) for later. The bill for a restaurant breakfast every morning - not to mention lunch, if that's what the extras were for - would have been considerable. As well, having to gather and herd those sizable school or larger multi-generational groups to a restaurant breakfast, finding enough seating, sorting the bill, etc. would have been a real PITA.
As a side note, not a single item was pre-wrapped. Every morning were eggs and potatoes of some form, bacon or sausage, 4 kinds of cold cereal, oatmeal, make-your-own waffles, toast, bagels, English muffins, blueberry and banana muffins. juice, yogurt with assorted mix-ins, bananas, oranges, apples, coffee, cow's and almond milk, Not too shabby. (I stuck mostly with cereal.)