I agree with you it's pretty annoying. I don't see why they didn't just use a basic 3.5mm or mini XLR which is so much more common. One downside to the "adapter" route is that those extra connectors are adding some impedance to the system. I don't know how much since I haven't measured, and it may not matter depending on the headphone. But, it seems kind of silly to shell out big money on cables that could make your headphones sound worse.