Any benefit is purely psychological. If this helps you think your system sounds better, who am I to argue. It will not last.Instead of doubting others experience which is useless....Why not thinking about OTHER things than trying to contradict their experiences with a superficial argument and trying by yourself?
A 20 bucks experience...
But remember that it is NOT the first embedding controls i recommend because the noise floor levels of an audio system could be too high to make the listener able to detect the effects...Anyway many people has verified his potency in their room...All across the world already by the way....
If you think that we are not a gullible bunch of idiots all of us, you can certainly think that we are perfectly able to think about your perpetual placebo counter argument by ourself and we dont wait for you to enlighten us about it...
We are perfectly able to observe that, by accident , by chance or by experiments, when the Schumann generators are disconnected, the sound is always affected....
There is a placebo effect linked to all new devices, the main experiments is precisely related to the CUMULATIVE experiments that will rule the placebo effect out for an ultimate explanation... Adding for example shungite or Herkimer diamond to the S.G. will affect always in the same degree but not in the same direction the quality of sound.... No more placebo effect here.... Save for zealots repeating their mantras....
Think and experiment or let yourself stick to your equalizer....