I don't believe there is an "tvOS Embedded". "Apple TV+" is just an app within the OS; there isn't really any similarity between the embedded app and tvOS.
I've read online some smart tvs will complain, often, to please connect them.
I'd like a tv that works for me, not for the tv manufacturer.
It's also got a remote with way too many buttons like "Netflix" "Disney+" etc. Touch them by accident and it immediately goes to "setup your tv account"
I have Plex, Podcasts, Soma FM, VLC, and Settings in my top row. None of them show me ads; I get to see what I’m in the middle of watching or listening to and jump directly to that content if I want.
Settings is the outlier, as I like to check the battery status of my remote somewhat often, but again, no ads for any of the apps I listed.
And even something similar embedded in some TVs.
What I could see Apple doing is some kind of "Made for Apple TV" feature that combines eArc, HDMI, etc, and makes the TV turn into a "dumb TV" for the Apple TV when it is connected and detected.