GGB No. Fullness proves that people want what you sell at the price they paid for it; it says nothing about what each order leaves behind once the costs of winning and serving it are out. A dining room filled by discounts and delivery promotions can lose money at capacity, while a quieter room with disciplined contribution banks more every month. Occupancy is evidence of demand; profit is evidence of structure — and the two have to be read separately.
From A Busy Restaurant Can Still Be a Bad Business — the full reading, with the method behind this answer.