The Sony Bravia I have now is the first Android device I have ever owned. It is also, coincidentally, the first TV I have had to hard reboot on a regular basis because the HDMI stack keeps crashing.
I have never and will never allow this thing to go online.
Mine is several years old at this point so could be better now... It's even worse for me, there is no rhyme or reason to the (several second long) input lag. Seems to be getting worse with age.
If you factory reset your Bravia and then decline all the Google features (don't sign in, etc.) it's about as close to a dumb TV as you can get these days.