Given a dumb TV is going to be more expensive, I can't see a market for it based on a small marginal gain for the consumer. And 90% of people don't even care enough about the poor user experience vs the marketing that hypes up features no one uses or needs.
Cold boots are reserved for failure situations or updates.
I agree with the point that most people deal with terrible user experience.
A lot of my friends ask me why I went with an Apple TV when my TVs have built in functionality or I could use Roku / whatever Google call their dongles now for cheaper.
The answer is experience. I’ve tried to deal without an Apple TV and my god, the number of ads, the slow UI response, color handling etc.. all have me going back to the Apple TV.
But none of the stuff I mentioned is worth the price difference to the majority of people.
Even the "good" ones like the Android TV in my Sony is sluggish clunky garbage in comparison. I gave it a shot when I bought it, but couldn't stand it. Disconnected the TV from the network and just use the Apple TV and it's nearly perfect.