Well when I got my first job at uni I bought a bravia tv just before Android TVs came out (around 2014 here), so it had whatever it was the OS before it and it was cheaper than the regular price.

Since Android TV and Google TV became the de facto OS for most of "premium brands", they stopped updating my TV around 2019 or so, and apps a bit after that. The youtube app became even more sluggish and slow, all other third party apps were gone. A couple years ago my sister messed with my TV so I did a factory reset and with that the youtube app went away too. Now it has only screen mirroring.

Which turned out to be absolutely great - I got to have a "premium brand" TV that I can keep it connected to the internet and use screen mirroring and send commands to it via its IP but it won't show any ad whatsoever because its OS is long outdated. And after 12 years everything but the "smart" part of it is working great as new. Of course it's not OLED whatsoever but I can't really care less - viewing experience is still great.