One thing bugs me, if Gallia has all these resources, how come their weren't found in the general settlement of Sirius? I mean, in the House infocards, you can see it was all preplanned to a point.
Liberty for trade opportunities, i.e center of sirius
Bretonia for mineral resources
Kusari for food resources
Rheinland, chose resources for the necessity.
Gallia, how did they get to prime location post evacuation of Sol? I mean really! How did they get the sector of space that is not only most habitable, but full of resources? How did four other research teams miss that? On one hand I can see that with an extra month or two more date could be processed for best settlement, but in a war of annihilation? I could argue weapons are the more needed.
A very good point as to why Bretonia seems underpowered in a lore sense, bit in the dev's defence wouldn't Bretonia seeing tension on the border invest in newer and deadlier ships? By a small comparison i call on the Cold War.