The most convincing thing a defence company can do is show its system working. It’s also the one thing most of them can’t do. The hardware is still in development and there’s nothing to film yet. The demonstration is classified and no camera is coming near it. Or the engagement itself, an interception, a launch, a sensor picking a target out of the noise, is over in seconds and invisible to the eye anyway. So the companies with the most to show end up showing the least. A render pulled from CAD. A photo of a shell casing. A diagram nobody outside engineering can read.