Quote Originally Posted by KalinOrthos View Post
I can kind of understand why it doesn't change. Unlike bows, which are an old and archaic weapons, guns are much newer, and the Aetherotransformer is newer still. It's basically a box that house our tools: gauss attachments, special ammo, turrets, the triggers for Peloton, Tactician, Palisade, and Refresh, etc. Moreover it seems to be a box that is pretty much made in Ishgard for machinists of the Skysteel Manufactory. Those aren't tools you're going to find some random mook from Garlemald carrying around.
By that logic very few of the MCH weapon drops make sense. I always figured we got the original lunchbox from Steph and from that point on improve it ourself. I see no reason why my character wouldn't be able to tinker with the box to work better with whatever weapon they are wielding, resulting in a different look for the box.

But in the end I would doubt SE cares much about the lore in that regard. They just show an amazing lazyness when it comes to MCH.