The only real disadvantage to cooking in an air fryer is the fact most of the air fryers on the market have small cooking cavities.  This is definately a disadvantage.  I own the Philips XL which is the largest cavity you can get for the Philips Air Fryer and sometimes it’s a struggle to fit the food in it.  The small cooking cavity means the food cooks quicker, and uses less electricity. If they make the cooking cavity too large though, it will be like.. well cooking in an oven.