alt Hacker NewsIIRC, the Beatles “Sgt. Pepper” album was among the first stereo-mixed albums released. As much fame as that particular album has, the original mix is really bad. Drums all left, guitars all right, nothing in the center. It sounds weird to modern ears!
Also IIRC, I believe George Harrison’s kid remixed it properly, just a handful of years ago.
One of the reasons being that more people had mono systems so the stereo mixdown was just kind of a "for fun" afterthought. They didn't take it as seriously.