Pet Peeve -- why do headphone companies make the LEFT and RIGHT symbols so hard to locate

I can often be found staring and squinting at my headphones and IEMs, turning them around and around, looking for the Left and Right symbols. Most are tiny and in the same dark color as the housing. Some are outside, some inside, and for some headphones, don't even exist (I am complaining about you, Sennheiser PC38X).

Why do the manufacturers make these important labels so small and hard to find? Aesthetics? Arrogance? Lack of human factor design skills?