One highly regarded streaming maker, Aurelic, has optimized their streamer for WIFI. I believe they think the Ethernet wire is noisy so they have optimized the WIFI receptor in their device such that WIFI should be the first option. I do not think any other manufacturer recommends WIFI as the best option.
I have a Peachtree Nova 150 and I am interested in seeing how the new WIFI module is implemented. WIFI has issues with dropouts, speed, and reliability, but mine is rock solid so I will investigate the Peachtree WIFI. Maybe they have optimized it for this purpose like Aurelic.
I have posted some info on Fiber Optical cable as maybe a better option than wired Ethernet for audio. The thread is called NETWORK SWITCH.