Because of mass-market economics, it makes (almost) no difference to the vendor whether the TV is smart or not. So just buy a smart-TV and don't connect it to the internet. It's that simple. Oh, and also, don't forget to live in the EU so you can refuse those contracts that add mandatory data collection.

I have documented how you can use an LG TV and disable its obnoxious "Hi LG" feature without giving it internet access: https://social.treehouse.systems/@Aissen/111267905868798609