What if it connects to the neighbour's network? Or somebody walking past? When you can't tell whether the "smart" part is switched on how do you know whether it's trying to download the latest Android update or worse?
As for broadcast TV, in the UK owning a TV with a tuner may mean having to rip out an old antenna cable and the hassles to go with it as well as making it harder to deny to the TV Licensing Stasi that you don't watch TV.
What a lot of us want are dumb screens (with some decently-powered USB power ports, perhaps) to plug things into. But, sadly, that doesn't sound flash enough for marketing so this shite is wheeled out instead.