Don't these celeb chefs understand that the food for hygiene and health reasons has to be chilled and stowed into ovens. When required the crew switch on a chilled oven and it slowly but surely heats the food to the required temp. When ready the food is prepared and served and looks like a soggy mess. It's always been the same especially when it's wrapped. Chilled roast potatoes will not be crisp cooked this way. Steaks will be bland and grey. Fish will be dull and colourless. The list goes on. That Yorkshire pud that was described as a soggy biscuit is just one example.
My advice would be to go and see Aunt Bessy and see how their products are made.