For me Android is just another OS, I don't really care for its FOSS roots.

Android TV is always catching up with Android versions, for several times its future seemed to follow the same footsteps as Brillo, Android Things, ADK, Tango, Sphere, Daydream, Sceneform, wearOS,....

And then there is the whole update story which is even more catastrophic than on phones.

So if I had to buy a smart TV, at least one from the vendor that owns the OS.