Air fryers are the kitchen wizards of the 21st century, but even wizards have their limits. Think wet batter, it’s a no-go unless you fancy a sticky mess. Delicate leafy greens can also turn into an unintentional experiment in dehydrated plants. And, of course, large whole chickens or big roasts might struggle to cook evenly. Unless you've got one of those fancy, larger models like the Ninja Air Fryer Max XL. So, while air fryers can handle a lot, it's best to avoid turning it into a culinary Wild West with everything you eat.