Question: why are tails left on shrimp?
Answer: “For cooked shrimp that might be served on a platter, where people would reach in and help themselves, I'm in the tail-on camp.” ... They say: Leaving the tails on makes the food more attractive; it adds flavor to the dish; it makes the shrimp look larger; it's easier for the restaurant; it's a crunchy and tasty addition.