E-paper is kinda incredible. It uses no power once its drawn and works off the light in the room. I mean, we could make this placard with the newest OLED displays, but it would look distracting and tacky to have this bright source of light next to the artwork.

Its not outdated if nothing can compete against it in these use cases. The same way I'm typing this message on a 101-key style keyboard with a design that is pretty much unchanged for 30+ years.