Every little bit counts
The real question is why the default color is orange and not white or gray.
It’s a steel tank, which develops surface rust. That is the default color of steel long-term.
The polyurethane spray foam insulation is orange.
That’s the default skin. It costs 100,000 doubloons to unlock the sick neon green and black skin.
That’s only if they release the DLC. Devs keep blowing their budget on the tech tree