I used an Aries unit wirelessly for at least 3 years. It was about 6 inches from the receiving unit. I never had a single issue and excellent sound quality. Both manufacturers (Auralic and Devialet) recommended wireless as the best option as long as the units were close enough and the environment was not problematic. Most are OK, unless you live in a power station turbine hall.
The problems with wireless occur when used between modem and streamer, and wireless repeaters lose about half the signal strength.
Having been doing ethernet based music for 11 years, I now have a direct fibre optic link from modem to music server, no switches or routers on the signal path, and the data link from server to streamer is ethernet CAT6a.
Another key to wireless ethernet is to avoid mixing data traffic. This is the whole basis of how Sonos works and really set the standard. Several companies take the same approach with their own wireless protocol, Devialet has one called Air that allows you to send wirelessly at 24/192 from an OSX device (I don’t know about Windows) with faultless transmission.
I have a Bluesound Powernode 2i and that sounds better wireless than ethernet wired from a switch.
So in my experience, and as recommended to me, wireless done properly can be optimal, and it has been my preferred route with two Auralic devices (Aries and Aries Mini).