I feed all of my snakes inside their enclosures and even though I don't see any benefit to feeding in a separate bin I don't believe it's a deadly practice. I just think it's more stressful for the snake and the keeper especially for those with larger snakes and collections. I've never had any impaction issues from substrate ingestion or increased cage aggression. I do have some very food oriented critters that will go on high alert when the enclosure door opens but a quick tap with a hook or paper towel roll and they calm right down.