> When can I buy a TV without smart features?

There is a limited selection of 'dumb' TVs in the world. The 50-inch Sceptre E505BV-FMQK has no "smart" capabilities and lacks WiFi or Ethernet.

The usual advice is to simply not connect the internal "smart" capabilities to anything; disable WiFi and don't connect a Ethernet cable. The built-in host and all the nefarious crap it wants to run can't reach anything unless you somehow connect it. Just use the TV tuner and HDMI inputs. If you need a network connection for streaming from some local source then block the TV at your Internet router.

Like the adware you get with many laptops and other mobile devices there are 'financial incentives' to manufacturers to build this stuff in, so don't expect the practice to abate anytime soon.