Ethernet Switch- what's the point?

So a good network switch can reduce noise and distortion, some of which comes from jitter. Anything else? How much of a difference should one expect? Like going from -90 dB to -95 dB noise to signal? Is it something very subtle but still worthwhile for some, or something quite loud and obvious to some, more so than typical room reflections and diffraction effects? I get the impression it's something far to subtle for me, and yet I can easily hear the difference between live music and any high end 2 speaker system. 

@recklesskelly "I would hardly call it persistence, more like trolling as this is the only subject matter he contributes to. And reading through his archives he is consistently chirping off on it." 

I have found that people who only speak on one topic usually know that one topic very well.  I have personally meet people who profess to know everything about every topic, and well, they usually don't.  I think that is called jack of all trades, master of none.  I am thankful for all the tech people who contribute.     

@12many well that is nice, not sure why you called me out as a good many agree he is a one trick pony. I am sure you learned a lot from this thread. 

I am thankful for all the tech people who contribute.

Wholeheartedly agree. Could it be that 222’s heavy-handed a smidgen and that is perhaps why ....