Miscellaneous misunderstandings...
Natural sound is only "mono" if you are listening to one sound from one thing, but how often does that happen in the world? Two ears allow us to place sound in relation to us; two eyes allow us to not only see by measure distance.
We could go further and say that the world behind us does not remain respectfully silent until we turn and face it, so no, we don't really live in a
stereophonic world, we live in a surround-sound world. There are still experiments going on in reproducing this. One day it might be sonically and economically acceptable to music listeners just as it is now to home-theatre watchers.
CDs measured better right from the start...
Did they? The underlying theory was better at the start, but was the implementation? Did CD
players sound better right from the start? Was digital recording done better right from the start? I am afraid those questions may not get such a positive response. I have an expensive, digitally-recorded double LP set which I listened to
once, because it sounded dead, and, albeit vinyl, it has remained my example of how digital music
can go wrong.
Now let's get back to reality. Isnt it similar like two persons, say playing a guitar, in unison. One is louder than the other at the speakers' position. That means the orginal single guitar recording is now played by twice simultaneous in playback. How can that be ever be correct?
Because it creates an illusion, and the illusion works very well indeed. If you think it doesn't work, then you'd better go back to 1930-something and tell them that they're making a big mistake with this new stereo thing!
You can always fight the illusion (or just connect your speakers out of phase) and hear it as two separate sound sources. You probably can't beat something like the McGurk effect by mental effort, but the stereo illusion is a little more fragile.
Thing is, though, just as we sit down to willingly immerse ourselves in the fiction of film or book, we are equally happy and willing to immerse ourselves in the fiction of stereo music. Best illusion
ever!