I bought a Vizio E-series 2016 for my father. Perfect dumb tv and was on the shelf at his local Walmart. (previous E series were smart). Probably $100 less than a smart TV. These TVs were unique in that the only smart features were provided via built-in Google Cast. So pretty much beam apps from your ipad, including a custom vizio app. Otherwise nothing smart -- no netflix, amazon, nothing. Using Google Cast worked great for me visiting, but was beyond his capability. He just wanted a dumb TV to watch cable TV on.
In 2017, Vizio changed strategy and announced a free upgrade for all 2016 E Series owners. To the "full" Smart TV package on almost every Vizio. And now his "dumb" TV is getting Airplay 2. I didn't realize until this article that this "free" upgrade was just another shot at monetization -- artificial price differentiation to make the sale (since obviously the smarts were in the original TV), then give the smarts free to those who didn't pay for it to unlock the third party revenue stream. Impressive.