Look, I think it’s a legitimate question, and I’m not thrilled about most “smart” TV operating systems. But why pigeonhole your search like this? You will almost certainly end up with a worse actual display, which is what you’re spending the money on in the first place. Just buy a nice panel and disable as much of the smarts as you can—-it’ll be fine. Android TV is the best option out there, in my opinion; and it’s what Sony’s run (the best panels out there).
If you buy something marketed as a monitor, it will have no (or terrible) audio, and you will struggle to find something in the >=65” class. I think it’s a fine option for a spare TV, but it doesn’t cut it for the living room.
I get why HN hates smart TV’s, but unfortunately the ship has sailed. I’d rather have a nice TV than be an activist, gotta choose your battles.