Altec,
I hear you (no pun intend) on the theory .... but there have been speakers wher i could hear a difference.
A while back, working part time in hi-fi store, i walked out of a listen session and walked back in after getting a diet coke.
I did not know that the guys in the room where going to play around.
when i came back in the same music was playing again and it sounded a little different. I thought they moved the speakers or where playing w/ room treatments....
They told me they switched to bi-wire.
It really did not make sense electrically ... but it did sound a little cleaner or slightly more open....

Just a life example.....

But i appreciate the input from you and psyprof1... thanks