Indeed it is. Though, I also believe that you have to consider simplicity, and a cable is just so very simple compared to WiFi.
Quite a few I know, have several annoyances WiFi 'falling' out, disconnecting and being way slower than cable, depending on placement and the materials of the walls surrounding the router and receiver. This often result in the need for an extension cable to move the WiFi receiver 2-5m away from the PC, to have a better signal, and then WiFi suddenly seems like a bad option, unless a cable between the PC and router is very difficult or visibly obstructive.
But I agree, that with most quality products and proper setup, a WiFi connection can work well enough, and with streaming audio, we need much less data than with 4K tv, for example.