The Samsung S90D (a 65" 4K model) you bought appears to sell for about $1000. Looking at Best Buy's site, you can also buy a Samsung 65" 4K TV for as little as $180 (model DU6900).
Yes, there's other differences. LED vs OLED etc. But at a glance they seem equivalent to a consumer...and one costs 5x more. The $1000 TV is targeting a market that expects more from their purchase and would potentially grate at a persistent sign-in notification. The <$200 TV is targeting a market that wants a big TV and hasn't thought much past that.
There's definitely a chance that on some models Samsung would be more aggressive about enabling smart features, because those models are expected to be subsidized by ads.