Inside a dry air fryer, there isn't anything to set the wet batter. Instead, traditional batter will just drip off while the food cooks.
You may be dying to cook broccoli in your air fryer, but air fryers can allow food to get dry. Broccoli without any oil might even turn to dust.
The basket or cooking racks, depending on the model, are smaller in their capacity than an oven — so a roast might not fit.
Melting a classic grilled cheese or making homemade jalapeño poppers in an air fryer can cause issues.
Melting a classic grilled cheese or making homemade jalapeño poppers in an air fryer can cause issues.
Rice and other grains that need to be submerged in boiling water can't be cooked inside an air fryer.
An air fryer doesn't have the same crisping superpower over raw produce. If raw vegetables are added to a stir-fry or other dish, then the results are much more consistent.