“Now "audiophile" ethernet switches are designed to improve delivery of error free bits to the streamer by use of improved power supplies, grounding, shielding, clocking, and other methods.”
Switches don’t improve the error free delivery, all packets are guaranteed to be error free or they will be retransmitted. How many times have you submitted a stock purchase and the broker bought you more shares than when you asked for (packet of data sent got corrupted and changed the 100 shares to 1000 shares)?
How about all the database data that is read from the server, does any of this data gets changed during transmission? Not a chance! If Ethernet packets were prone to errors, the financial and brokerage houses will be a disaster.
Another alternative to a switch is to have multiple routers setup in bridged mode in your house to use the ports on the back of the router to wire your dac, streamer, and server to