More knowledge is nowhere near complete knowledge.
That said - I actually do understand how quite well how Ethernet works. I also understand digital transmission quite well in general.
Unfortunately, I do not understand why an upgraded switch makes a difference other than perhaps the extraneous noise being carried along. Yet (for the nth time) it is measurable. And I only knew that it was measurable after I listened to the difference. We’re not talking night and day, but we are talking audible.
What I also don’t get is why those of you who think you’re so well versed in such things are unable to understand your own limitations and are correspondingly lacking the intellectual curiosity to even explore further. And, in the process you call all other people who’ve delved into this (manufacturers and consumers) deluded or dishonest.
Do the work. Explore for yourself. Then come back to us and tell us you found no difference. If you do that, I will accept your viewpoint gracefully. However, until then - your “evidence” is merely your belief.
Do the damn work before claiming intellectual superiority. Until then - your word isn’t even as good as others who have done the work. Sheesh.