All this makes interesting, if not debatable reading. I have been to what is one of the acoustically greatest stages in the world, the Sydney Opera House. The magic that happens there is truly a wonder of the world. If I could get my music room to sound 10% of that I would be a happy man. If I could afford I could a worthy stereo, I'd be happy.
I read recently about the work Franck Tchang did with his static resonators with different metallic properties. Fascinating. Then there is the SOH with its phenomenal acoustic properties. I haven't travelled to the majestic concert hall of the world, but I will freely admit that acoustics can be changed using all sorts of materials and placement.
I would not think there is one spot where a stereo system is perfect in placement in a room. What does change though is the listeners perception of change. I can sit in one chair or another in my lounge and the same LP will sound perceptively different, or the hearing in my ears are way different. Probably the way the breeze passes from one and out the other... :)