@yoyoyaya It's not an authority fallacy, it's simply basic facts. However, not everyone understand these facts, but they want to portray themselves as have an understanding.
Take the example of John Swenson, founder of UpTone and designer of Etherregen. He was forced to admit that he made up terms, terms that does not mean anything, for his intended customer base with the Etherregen. Why forced, because he was confronted by actual engineers.
So again, a switch cannot improve anything, this is a basic fact. A really good switch doesn't add too much latency, no jitter, or packet loss, while a bad switch introduces lots of bad things. Luckily, most $30 switches are more than capable to handle most residential applications.