Good luck with your nose and ear hair situation.

Think about it for a second. Let's say you have an amp whose case is poorly damped and made of thin metal. Now, compare it to the same amp in a well damped, heavy gauge metal cabinet. Do you think this difference would effect sound quality?

I think so. Resonances make a difference. Racks have an effect on resonances of components. So do the feet on components and racks.

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.