"Finally, I see constant sturm und drang re: subjective use of the unreliable ear...so now we can use ears as an arbiter of accuracy?"

Frankly, I don't see how you can avoid it. If you are tone deaf there is no point in buying an expensive sound system that meets someone elses criteria of accuracy. That is after all the ultimate goal and test of how well these systems work for you which is why you buy them.