A few thoughts on the subject:
In my experience the only thing that sounds worse new out of the box is a vacuum tube.
Do driver manufacturers run new production drivers for hundreds of hours to "break in" before testing, or do they test them right off the assembly line?
Do capacitor manufacturers state on their data sheets that hundreds of hours of use are required prior to use in critical filtering or timing circuits in medical or aerospace equipment?
If something doesn’t sound right out of the box then it always will.