Gosh, really?
Well, colour me unsurprised.
Smartphones don't get security upgrade patches, just a full update once in a blue moon if you're lucky and it's not too old, so why would anyone be expecting tellies 'n such to get 'em?
Heavy hint for the very, very thick: If you expect whatever it is to last more than 18 months[1] and it has an internet connection, don't buy it.
[1] I.e. longer than it'll be in production.