Something I didn't think of- some weapons would look REALLY weird on gunnery platforms. Most of the double barreled turrets for example, or the hellbore, which is an example of an asymmetric weapon. And how useful would it be for those weapons. At the current time, all I can think of is missiles and Tachyon Lances.
"Multi-barreled weapon would look weird on it"
More of a cosmetic thing than anything else, what prevents you to go in the game file, change the sprites and voila no more "ugly" guns
Besides if its such a big problem either they COULD:
1: NOT be put on thoses to begin with
2: some salvo based weapons would benefit IMMENSELY from that, namely plasma cannons and Pilums to name my personnal most used
3: it would be like having, firepower-wise, a ship on a ship, always having a set of weapon capable of engaging a ennemy trying to pull a quick one