They try to use "smart" features to promote their products, but instead what they do with them shortly after the purchase has exactly opposite effect.
Also some of them (Samsung) intentionally break some (or all) smart features in some cases [0]. Even if they are legally allowed to do so (And of course they do. Who reads TOS...), it makes me really uncomfortable to buy any "smart" TV. It's a pity one cannot buy a dumb TV with quality picture and sound today.
[0]: https://www.archyde.com/samsung-blocks-the-tvs-of-russian-us...