One of the niftiest features of Google Home is the ability to group the various devices together to control said devices in a more logical manner. It seems like a no-brainer feature that you can now include Android TV devices as part of these groups.
The ability to group devices within your Google Home setup has always been a valuable feature. This gives the user the ability to organise devices as they see fit (by room or floor, for example) and have them play different music or content by group. A recent update in the Chromecast built-in app of Android TVs has now given users the ability to include Android TVs in these groups.
Some reports suggest that this currently only working for Nvidia Shield TV models but we can only expect this will be rolled out for other TV models shortly.