I -think- the use-case Alex is concerned about is battle-carriers (or, especially if the OP cost gets reduced along with a change to a single-fighter wing, ships using Converted Hangar) with a wing of tridents held in reserve, where they'll just hover around the carrier, fire their harpoons at nearby targets, and more-or-less-instantly re-arm.
Which is something of a fair concern; I do do exactly that with Longbow wings on certain ships - leaving them on reserve to fire sabots at whatever gets close, and only rarely giving them an actual engage order.
Edit: Though I'll also note that Longbows on reserve are also useful as a bit of extra PD, and, unlike most interceptor wings, will actually tend to hover around the rear of your ship to help intercept salamanders.