Leanback Launcher is probably the worst part about AndroidTV. I'd love to set a new default launcher and bind it to the home key.
Update: Totally still possible, if a little convoluted. I needed to downgrade firmware to pre-ship, root, and use adb to hide the Leanback Launcher. I had TVLauncher ready to go when I did. Home button works like a champ now.
most probably not without rooting it and if the device keeps restoring the default launcher on reboot, a script to run every boot to correct that.