When the "smart" features age out to obsolescence, you can still hook up a chromecast/roku/etc., just like to a "dumb" TV.
If I could have gotten the same TV without any smart features and an external Roku, that would have been better long-term, but almost all newer TVs now are smart.
Its important to remember that "TVs" are just "displays whose bundled additional features include at least a TV tuner".
Unless you absolutely need a TV tuner, you can get displays that include neither a TV tuner nor smart features, but they aren't sold as "TVs" because they aren't.