Simplicity
I do not use wireless networks for the infrastructure. However, the control systems are acceptable on wireless devices like iPhones, iPads, laptops, etc.
I treat the system as an appliance; the master music files are stored elsewhere, and copies are kept on the server.
I have used file servers and NAS devices and abandoned them as part of the playback system to reduce network traffic and server computing loading.
In the long run, Power Supplies can make an essential difference in sound quality. I find that supplies with super-capacitor outputs are fascinating.
Software is the king of sound quality. It breaks sound quality by just being there. The less of it, the better.