I just read about the granite.
I used to get severely criticized when I poopooed the effectiveness of a slab of graite under a component.
Granite can induce ringing not soak it up like wood or rubber can.
All components vibrate. some transformers have mechanically noise and can vibrate, hence the use of isolation washers.
Everything is in movement.You may not hear the sonic degrdation of one cap resonationg along with the music, but add up all the little separate parts used inour gear and things get into perspective that it's the sum of all these parts ringing and vibrating that causes a loss of clarity and detail.
Of course if you are multi tasker or background music listener, then this won't make a difference to you.
I find so much of the denial of anything but stock out of the box,quite fascinating.
The only way you can tell if a vibration control device works is to try one, then take it out of the system and listen again.
If one device didn't do it , try another.
If scientists gave up after the first failed experiment and made up their minds that nothing works, it's all snake oil, then we would be deprived of some very important and beneficial advancements.