Pretty self explanatory I think. Torpedoes are not Missiles. they are Torpedoes. In space there isn't much of a difference but since you decided to call them torpedoes lets stick with it. I know that you know the only Torpedoes people use are Reverb Torpedoes to take out shield generators. So it would seem beneficial for big ships especially to know when they have a couple locked onto them. For ECM users it would alert them that now is the time to use it. For Point Defence users it would tell them to start evading and praying. And I think that this is especially true if you ever plan to "flip the switch" on Engineered AIs.