Earlier quoted context omitted.
Netflix, Amazon Prime, Mubi, BBC iPlayer... in Hi-Res, UHD or 4k mode. The apps with rich capabilities are restricted to the platform. Android is the one with them all. (caveat on Amazon vs Google stupidity)
Is there any concern with a smart TV that isn't connected to the Internet (using a chromecast to connect to netflix)?
If it's doing some kind of "always scan WiFi in the background" shenanigans then it's still a computer slowly going out of date without security updates and occasionally exposing itself to the local area.
I wish I could take a "smart" TV and flip a switch and have it gracefully fall back to "dumb" TV where the Android device is physically disabled.