Some of it however was wondering about the interaction of mastering engineers, speaker makers, and amplifier makers.
In a very real way, THX film sound has things MUCH easier time than we do in music. There are objective measurements for frequency response and room acoustics which must be rigidly adhered to so a mastering engineer/sound editor isn't guessing about what speakers you might have, or amplifiers.
That's not the case when it comes to music. There's tons of value judgements and expectations being made by the artists/engineers.
I wonder about how this interaction defines the high-end.