"The fact that's completely impossible to buy a dumb TV anymore (the only company I know of that does something like that is Vizio, which isn't present in the EU market) is starting to become a huge problem - if you want a big screen in your home, it's impossible to not install the greatest malware vector and security risk in the house."
It's actually quite easy to buy a "dumb" screen and those dumb screens just happen to also be the nicest, longest lasting, physically tough screens you can buy.
I am speaking of commercial displays which are produced by all of the major manufacturers.
You know, airport displays.
They are fantastic displays, they typically have very, very small bezels (even if they aren't displaywall displays) and they are as dumb as dumb can be.
I highly recommend a commercial/signage display.