It's pretty awkward when your eyeballs are positioned on the sides of your head so that while you can see a predator about to swoop down, you can't actually see the food in front of your face very well. Plus you don't have any hands to maneuver it with. It takes a lot of practice and sometimes you get it wrong. And if it's a small enough meal, maybe it just doesn't matter enough to bother with all that maneuvering.