I have a TCL Android TV, and just adb access, not root, allowed me to change the default launcher, which makes the home screen really quite beautiful - mostly a pretty background and just the apps I want; and no fucking ads.

I don't feel the need for root, but I also don't want to brick our main TV.

Once it becomes the secondary, though, and once the lineageOS equivalents for TVs start coming out, I'll be tinkering.