When you run Tidal direct to the Kefs, there is only one way traffic. The music comes from the internet and goes wi-fi straight to the Kef master speaker.
When you run Tidal via Roon on a wireless core, there is 3-way traffic. The music comes from the internet, goes wi-fi to the core, goes through Roon, goes wi-fi back to the router, then from the router wi-fi to the Kef master speaker.
You need 3-times the bandwidth to stream Tidal via Roon over a wireless network compared to streaming via the Kef app.
If you connect your core via Ethernet, you only need the one wireless “hop”. So you’re down to just one-way traffic over your wi-fi network.
I have LS50W and I hard wire my core and leave the speakers wireless. I tried wireless everything and got dropouts, especially with hi-res tunes.
Hope this makes sense. 