This isn't difficult: TVs should not be "smart". TVs should be incredibly dumb. They should be screens for displaying stuff. That's it. Nothing else. No network connection of any kind, no apps, no software beyond that necessary to do basic setup of how that screen works: brightness, input selection, etc.
A TV is not a monitor. it probably has an antenna connector, and because TV signals are digital nowadays, it has to decode the radio signal and support a variety of compression algorithms. Most TVs also have all sorts of image processing algorithms. At least a scaler, but most have other, sometimes questionable features. Plus overlays, recording, picture-in-picture, or whatever the manufacturer thinks will improve sa…
https://www.swedx.se has dump monitors for regular TV prices.