I'm a bit curious...
As I'm familiar with the antics in Freelancer, and the many MechWarrior games...
I wonder if the Drayman could fall into the category of "Capable of having, but doesn't necessarily have."
In Freelancer, the freighters are, for the most part, capable of having 6-8 turrets, but most of the loadouts only have 1-3 turrets.
In the MechWarrior games, most of the BattleMechs are capable of having a lot of armor, and enough heat sinks to keep from shutting down everytime they fire their weapons, but most have paper thin armor, and only enough heat sinks to allow only one or two weapons to be fired at a time.
So...
Could it be that the Drayman was (is) capable of carrying weapons, but just never had them installed?
But then, again...
I don't recall any of the Cargo ships in Privateer 2 having weapons, either.