Just a FYI. I finally installed tvOS 10 Beta, and HDMI-CEC is working much better than before between devices. My setup is a Sony 4K receiver, a Vizio TV and the AppleTV 4 Gen. With the sleep function enabled, after the preset time passes it shuts off the receiver and TV, after no activity. With the press of the ATV remote, all the devices turn on. On 9.2 it never worked that well. So as a cord cutter and the ATV as my only media device, I only need one remote now.