Recording sound is a different process than playing back the sound. Microphones are not same as speakers. What you are playing back from is a finished product. You're starting all over again when playing back so getting the best out of it is a new game.
The using the same cabling used in recording during playback argument is no more valid than the one about all that cabling that comes before your outlet, or the ones in your amp. They're all red herrings.
An old and talented sound engineer with lousy hearing, crappy speakers and whatever limitations he's under knows what to do to get the best sound just like some deaf composer can write a symphony and know how great it will sound.
All the best,
Nonoise