These were science fiction when I started work on Vault-OS over a decade ago.
I knew they would come down in price, it was just a matter of time.
Best way to bolt one of these onto the headless server instances is a Lua script plugin which converts X-Forms from an AJAX call to the server into an appropriate matching display that normally would be a presentation layer in HTML. You could skip the need for a browser and run this as a controller front end direct to the server.
Getting cheap for a nice sized display, especially with built-in touch screen interface over serial. Very nice looking graphics and control widgets.