For many years I'm using Itunes on MacMini (that I use anyway) to play music over WiFi (5GHz) using Airport Express and DAC. It is simple and I never had any problems. Sure if router fails music stops, but the same can happen when CDP fails (it happened to me), when preamp fails, when amp fails etc. Routers are cheap these days and you have to replace them anyway to get access to internet.
Servers: Are we there yet?
I was shocked to discover that my brand-new high-end server is entirely dependant on a functional wireless network. If either the Ipad or the wifi are not working, the server is rendered non-functional. I spoke to the dealer and he informed me that all the servers he carries are like that. Huh?!?