Sorry, my response was super delayed, and it's not really responding, I just wanted to cite a piece of trivia.
Alan Licht stated that the decline of western civilzation began with stereo separation. He's a nutty guy, guitarman, writer ordinaire etc.
He went on, "mono is truer and more powerful sound replication than stereo ... the sound is thicker and more focused ... Multi-tracking diffuses the sound," -- I suppose that this is a commonly held understanding.. the discussion here just reminded me of that bit about stereo separation.
the excerpt is from an emotional memoir of martha quinn , it's an amusing book about music and pop culture.