Car manufacturers go to great lengths to save material (costs) and weight and you ill be surprised at the lengths they will go to seek those efficiencies. The inside of the engine compartment, inner frame covered up with trim, and the inner edge of the body do not receive all coats and in particular, the 'heavy' clearcoat that gives the gloss.
It is normal, and standard practice these days across many manufacturers.
Notice how your car doesn't have a cigarette lighter? (unless you tick the smokers pack option)