“Or is there at least one where Smart mode can be turned off verifiably AND it doesn’t keep enticing you to turn it on by withholding ease of use or some convenience feature until you just give up?”
The question is not whether you can buy a dumb TV. It is whether the off switch for the smart part works. TV makers sell the panel cheap and make it back on ads and viewing data. The best answers are commercial displays, digital signage and never giving the set your Wi-Fi password.