This is a big concern for the elderly. They have major challenges dealing with "smart" TVs and smart phones – due to complicated interfaces that are difficult to operate, hard to read, hard to interact with , slow to respond do. I see a huge business opportunity selling simplified consumer devices to the elderly. I'm surprised CES hasn't yet created a specific category or certification for elderly-friendly devices.
I've never seen a smart TV with objectively simple and good UI. LG's annoying menus and motion-controlled pointer are a good example of bad UI.
I will say though, I've only ever owned LG TVs since flat screens came out, and I've never had a problem with the "just don't connect it to the internet" strategy.