Does moving smart devices to IoT (such as Ring doorbells, smart phones , Alexa, etc) have any benefit to a Ethernet connected streamer sound quality?
I haven’t noted any difference as I recently moved a lot of smart devices to IoT.
More time on my hands since recently retired 
David
Not sure how you have your ND555 ethernet cabled to your router (EE8 or Cisco Switches ?).
When I placed my ND5xs2 (with nDAC/555DR) as a sole device on a Cisco C2960G-8TC switch I was surprised how much better it sounded. I have since added two more C2960G switches for cascade purposes.
All of my IoT devices are on very separate “WiFi access points” that don’t touch my audio-only switches.
The C2960G was a very low cost & successful experiment.
I use an ER switch which connects from router then to ND555
I was just curious if moving devices from main router SSID to IoT would “clean up “ the main router SSID?
Thanks,
David
Yes I advocate separating and distributing IoT devices to multiple separate network devices.
I have WIFI disabled on my primary router, as I have two additional routers connected via Ethernet as distributed Access Points located on different floors and at opposite ends of our home which is Ethernet wired to 10 rooms.
Each WIFI-7 access point has three separate SSIDs for 6GHz, 5GHz and 2.4 GHz to which I have assigned various IoT devices for wifi bandwidth balancing (mostly on the 2.4 GHz) There is a separate guest SSID.
I also try to put the non-audio Ethernet devices on these Access Points.
Next I have one Cisco C2960G off the main router that is for distributing Ethernet to two more Cisco C2960G switches- one is dedicated solely to my NDdac555 (ND5xs2/nDAC/PS555DR) in the audio lounge, 3rd Cisco switch is located in the study for the Naim Core and Synology NAS.
Maybe all up a network overkill, but this is what happens after a 35yr career with an Enterprise networking vendor.