That's not the reason why. Air fryers take longer to cook an item than does a regular fryer. When it comes to meat, often I have to cook it for nearly 30 minute

That's not the reason why. Air fryers take longer to cook an item than does a regular fryer. When it comes to meat, often I have to cook it for nearly 30 minutes just to have it reach a safe internal temperature in its center. Restaurants do not have this much time. Even then, the number of servings is small. Restaurants need speed and volume; an air fryer grants neither. Fwiw, one can always spray oil before placing an item in the air fryer, although it's entirely unnecessary from a cooking pov.