Agreed, but I've found Windows to be relatively finicky with the shutdown command, with some OS versions being fine with that and some not. Additionally, on Windows often the action needed is a GUI program with no simple way to post-hook or provide an output a CLI can easily ready.

As such I usually set my timer 3x what it needs to be (e.g 1800 for a 10 minute) and it's always had a high chance of working.