This was obviously written before Phil Spector was convicted of murder. It was that event which made me wonder what must have been so famous about him. Having listened to his “top” tracks and read about his sound “layering,” I have to say, what a mess! Turns out his sound only aimed at filling the entire — and very narrow — audio spectrum of AM radio to make songs stand out and that was it.
Not only is that mono but also he seems to have had no interest in realistic presentation. After FM and stereo became mainstream, his star faded. I would not put too much stock in his preference for mono.