Its 20 years old tech and by now you would think they would come up with something clearly better. It feels like they have got a bit lazy.
Sounds like there's a killing to be made by developing the clearly better HD-600 v2. Why not get that engineering degree and make it happen? You have an extra 20 years of technology advances to lean on. Or you could write to the multitude of headphone companies out there and pitch this fantastic plan: "Make a better HD-600". Boom, so easy, I wonder why everyone is being so lazy.
(Since this is an international forum, yes, to be clear, this is sarcasm on my part.)