I know very well about hdmi-cec. And it ISN'T a standard set in stone. Like hdmi arc, it's a fudging pain in the ass. Among many other faults, it is the cause of units powering up by themselves (usually in the middle of the night). But that wasn't what I was referring to, it was the ability to (not) control it with the phone, as only iPhone is supported, unlike something like chromecast or Nvidia shield, which you can control with ANY phone.
Only apple (fan boys) could say that being able to control a unit with only a single type of phone, is a benefit/feature! Hahaha!
Well what can I say. Mine all works perfectly anyway. (ARC included). Sorry you seem to be struggling with it all so much.
I suggest the issue might be a ‘fault between desk and keyboard’ ;-)