Except that that gets you precisely one option, which isn't even normally the one I'm looking for. When pressing the power button somehow gives the the restart/sleep/shutdown option, then it will make sense.
This has been around forever, since at least Windows 2000. The power button signals the OS through ACPI to shut down correctly. It wasn't always reliable on all hardware and BIOSes, and didn't always default to that behavior until set in Control Panel - Power Options, but soft power-off is supposed to have been working for a long time and is hardly new.
> Or just press the power button, which actually does make a lot of sense.
No it doesn't. Pressing the power button implements what the PC maker wants to implement. In many cases (especially on laptops) it's for the computer to go to sleep.
There are a lot of things about Metro that I dislike, but killing the "don't touch the power button on a computer" idiom is one that I do like.