A good question not likely to receive a satisfactory answer for you.
But, we hear what we hear. Who are we to judge either those who hear a difference or those who don't. Both are right. Those who hear a difference flat out hear a difference no matter the reason. I find it silly when those who don't hear a difference post that people who do are wrong, like they know better than the person who is actually experiencing it. Whether it's due to some as yet undiscovered scientific explanation or individual perceptual reality bias, we hear what we hear.
We've known how to utilize electricity for our purposes for a long time, yet it's still not truly understood how in its most basic constituents all that voodoo works.