You will get various responses to your comment. Recently, I added SBooster liner power supplies to my UltraRendu and my NUC i7 running ROCK. I perceived improvements in sound quality with each step. Cleaner sound and improvements in sound stage. For instance, on the UltraRendu (which feeds an Oppo HA-1) the width of the sound stage improved. The instruments and/or vocals that are mixed to the sides appear about an inch or so behind my ears with the headphones on (Oppo PM1s) whereas before they were a bit in front of my ears.
Also, well recorded (and that is the key) vocals are cleaner. Favorite example is Neil Diamonds Stones and Serenade albums (192/24).
As far as powering a network switch with a linear power supply, well I have not tried that. However, I suspect that is in the same category of $$$ Ethernet cables - won’t make any difference. Going further would be to power my Synology NAS by a liner power supply, but that again is excess.
In summary, I think that anything that is directly involved in processing music files will benefit from a linear power supply. Once you get into moving bits around your network, I am not sure it will make any difference. But, again, others may have other opinions.