If a cables will never fully settle-in from normal use, then if we just buy a cable that we like in this partially burned-in state, we can forget about trying to burn it in more, and just enjoy the music.
How can we be sure a cable won't get worse after we burn it in using burn-in device? Where is it written they will always sound better?
Since a cable will lose some of its "burn-in" from non-use, then why bother? We really would have to put our cables back in the burner each time we stop using the system, or we have to leave a CD playing 24/7/365.
In the end it seems like a lot of trouble for nothing; and I am a big believer that cables matter.