Or easily re-connect AirPods from the phone to AppleTV and watch at night without waking the whole house.
I use my Apple TV as a security camera system, in addition to acting as a TV and extra seamless monitor. Video chatting my whole family on a 65” screen is nice too.
do you mean through Airplay?
Yes, technically that's what it's called, but all I do on my mac is click on the second icon from top right of my screen, click on screen mirroring, and choose my AppleTV.