The other catch is that those displays are built for heavy duty use, not for picture quality, and as such aren’t going to look as good as even a budget consumer OLED TV.
Disagree. They look more than fine, much better than the budget TV with their fake saturation turned to 11 out of the box. If you think that looks good you might have gotten used to it.
The ones the serve menus and the ones that serve eye-level video ads are definitely also built for picture quality. Still IPS for the most part, but uniformity and colour calibration can be movie-worthy