Hi folks
The topic caught my attention, and I'm glad it did and I read thru to the latest post. There were many things I read I had a xomment in mind, but too many to remember, so this is more general.
Firstly, I use WiFi to connect to my Devialet Pro, which is my streamer and DAC (andamp). The roon core is Antipodes CX Oladra with a few enhancements. I have concluded (so far) that the benefit is ... not connecting another wire to the Devialet. The wifi is a Mikrotik mAP lite, powered by usb battery. It is a foot from the Devialet to ensure strong connection. Nothing else uses that wifi. It is connected to Etgerregen Side B via Shunyata Sigma. Basically it 'floats' between the moat and wifi and AC. There other tweaks to it. This has evolved and far superior to when I first tried wifi for this connection years ago and someday I try plugging the Sigma into the Devialet.
ER Side A connects to the CX and via fibre to my Router - Mikrotik CRS 305, a little brother of the model used by Dejitterit Switch X. I got that idea from Audiophile Style 'Optical Network' thread which highlights the benefits of the 10G spec (low jitter, perhaps why Chris chose it for SwitchX). The CRS 305 is obviously better than the Ubiquiti EdgeRouter X SFP it replaced - it was a straight swap. The CRS 305 connects to the ONT (1G national broadband). It also connects via fibre to a FMC > Cat 6a UTP > TP Link WAP to provide wifi which I use to control roon.
My network has no other traffic when I listen to music, except me browsing a bit online.
The ONT and CRS are on a separate AC circuit, AC isn't optimal, but I use ifi AC purifier as AC conditioning and ground treatment. However the ER is on the dedicated audio room AC (JPS labs, Furutech AC, 20A breaker) and has its own conditiioner (Shunyata Sigma > Cyclops > Synergistic Research Atmosphere Level 3 > W4S LPS > Synergistic Research DC cable).
All network hardware is on Synergistic Research Tranquility PODs, and grounded to Synergistic Research Ground Block SE or passive block, mostly using Hi Def Ground cables.
In all this context, my wifi is doing very well. It is not preventing me from hearing the benefit of every tweak, roon update and even increasing my ISP upload speed from 4 to 12mbps.
But I would recommend keeping a mesh wifi outside the direct route from ONT (or whatever you may have) and the audio gear. Unfortunately it seems every bit of the network can be optimised to improve sound quality outcomes. I have taken the route of optimising rather than adding more switches - I still have more that can be done.
I am intrigued by the SwtichX, it could be a router. Synergistic Research Router functions as a 2nd router that separates the audio traffic/activity from the rest. I gather uses a 1G Mikrotik Routerboard, however it's jitter might be lower than typical 10G due to all the 'treatment' it's wrapped in. I think Network Acoustics Router is 10G. On the topic of routers, a problem is firewall and other security is much easier with mainstream gear. Maybe there a way to have one router in the direct route to audio that operates very simply, but with 'something' connected to it doing security outside that direct route.
I hope all this is thought provoking and useful in some way.