It still feels more like Bretonia would rather try to fix stuff instead of having complete replacement modules just lying around in case that a ship gets damage: to replace the modules, modules must be available, lying around, stored away. Ressources unused. Hm...while I could imagine only in really heavy damage stuff getting replaced, I just can't think of them trying to replace anything "not ship-breaking" with a new module. As I said, I would rather imagine them try to fix it in any "cheaper" way possible than having lots of unused modules lying around for whenever a ship gets damaged.
Hull panels, electronics or other basic parts for example would be available more easily since "all ships" need them. Producing a module means only one ship can use them: either for the ship to be build, or for it to be fixed.