There are a lot of use cases where you want a machine to be running constantly but don't want the screen to be on constantly.

I can't put one of these in my bedroom unless I can easily and instantly switch the monitor on/off.

[edit] I have an existing PiTFT which also doesn't have a power button. I can turn it on/off programatically, but still a power button would be highly useful.

[edit2] Can this screen be turned off programatically without turning the Pi off at the same time, if the screen is powering the Pi?

[edit3] Hang on. Is it even possible to turn the screen on/off programatically from the Pi if the Pi is powered separately?