Perhaps you can't hear the difference between hardwired and not.
Perhaps you can't hear an extra connector in the signal chain.
Perhaps you can't hear the difference between thicker wires or thinner wires.
Perhaps you can't hear the difference between generic supermarket interconnects and hifi ones.
Perhaps you can't hear the difference between balanced or single ended.
But add it all together and maybe you have something that is more than the sum of its parts? Hmmm?
Rewiring my HD800's is one of the best mods I've done to any of my hifi gear. For me it has lifted the HD800 up onto a platform where it sounds not only equal or different than the LCD-2/3/X, but to my ears and for my tastes, clearly better.
Rememeber that this is the High-End section, the constant strive for perfection is nothing new here. It is possible I could the majority of the percieved improvement by simply changing the cable, and not hardwiring. But I could do it, so I did it.
It was a fun project and I'm more than happy with the combined result. If you don't want to, you don't have to.