I agree that a space flamethrower in reality is stupid. But for arcade games, it’s not the realism that’s important, it’s the way it plays.
Actually, you gave a good idea to use the term not “not a flamethrower”, but “energy flow”. But I still don’t understand how this accounts for the concept of a single player bullet on the screen. Am I right in thinking that you can make a V-shaped plasma flow that only shoots a short distance?