Hardwiring (with the Sonosnet turned off) will also improve the WiFi performance in your customers residence. I struggle to see why you wouldn't do it when all the Sonos products are hard-wired.
Well, except for those who want to 'just turn up, throw in a Play 1 and bolt out the door. You know, hacks who only want it to be 'easy because tech is hard'.
This industry is not getting cheaper and cheaper, we're simply convincing ourselves that we have to push the cheapest option to customers. #makesonosgreatagain
