Well what do you mean by slamming the power button? Because I understand a hard shutdown to be turning off the power or holding the power button till the power turns off.
Just pressing the on/off button is the same as selecting shutdown from the menu, that’s properly shutting down the pc and not a hard shutdown.
Shutting the power off can fuck up a system pretty bad. Nothing much a driver can do about that, everything in flight is lost.
Back in the day (pre ATX) the power button actually turned the power off. That’s where the screen from the post comes from. When you used to shut down Windows, it couldn’t turn the power off itself, so it showed this screen so you could turn the power off yourself.