The Home tab should be an inbuilt feature of Android TV. Streaming cameras, checking on sensors or quickly toggling on/off lights and devices could be a great feature which could be added to Android TV.

Old TV with coupled with cheap android boxes could easily be used as camera monitoring devices - for streaming multiple camera feeds.

A simple two/three quick clicks on the microphone button (on tv remote) could be used to bring up Google Home screen.

Option to enable/disable Smart Home device specific notifications on TV could be a great addition.
Imagine while watching Netflix you get a pop-up notification that 'Person detected on front door camera' and you could quickly check out the camera feed in one click.