The Orbital Smoke Strike is a Barrage. It should really benefit from the "More Guns" module and gain an additional salvo.
Having more coverage is always useful no matter the Stratagem, and that goes especially for most maps where the smoke-shells are most likely going to land on uneven terrain and not properly block enemy line of sight.
The majority of the time you're never going to be dropping it on near-perfectly flat ground like in the showcase clip from the Stratagem menu in the Destroyer.