The implication is that this isn't a problem that can't be solved, and thus stronger remedies are unnecessary. There might be some who disagree.

To be fair, I don’t think most people would consider a solution that voids the warranty on an expensive TV valid...

Hacking used to be about modifying your hardware.

Smart TVs are relatively cheap compared to large industrial displays. They are also reliable. If you need large secure (no wifi) display, this is pefectly valid option.