I've always taken issue with smart TVs and their probable accelerated obsolescence. The TV vendors are not motivated to maintain or update the software on old models, instead focusing solely on next years model.
Why would you care if you get a "Smart TV"? I have LG OLED, 5 years old or so. I have never installed any software on it. I have never connected it to the Internet. There were a few obvious bugs in the UI at the start, so I downloaded firmware update and updated via USB stick. Now those are gone, so why would I care about software support?
As long as the HDMI connectors and the screen works, what's the problem here?
The TV still needs to run OS (in LG's case, the WebOS, which is Linux-based - you can jailbreak it too if you want), so if some folks are running apps on top of that, fine by me. If you'd get the exact same TV without "Smart" features, meaning you couldn't install apps on it, it wouldn't be any different. Maybe slightly smaller flash storage for the firmware and apps because you wouldn't need apps.