Unless you believe Microsoft intentionally designed the OS to hose your presentation by rebooting right when it believes you are doing one, this is incompetent/bad design, not "malicious" design.
Let's compromise and call it "depraved indifference". No update ever made is that important that it needs to boot me out of what I'm doing at the moment.
That's another thing that bugs the shit out of me, to the point that I made a passive-aggressive bug report out of it: The update process is 3-part, and two parts of them require your input after the first part, if your computer didn't automatically restart. First is the force shutdown "blue screen," which, with no restart, can leave your computer/laptop in a time-bomb "fuck you" state. Woops, forgot that the last time you turned off your computer, it was an update-shutdown? Hahaha, you need it for a presentation in five minutes? Jokes on you, we still have two update screens to go!
Then you have the black screen with the circle, and then the blue screens "we are configuring your updates and didn't touch your files".
Incompetence as an excuse can only go so far. It's not like Microsoft is unaware of or completely ignorant that people use their Windows systems for all kinds of things — sometimes even mission-critical things. Choosing to ignore an ill you created despite knowing the consequences it has on others is not incompetence.
Things like this[1] should not be possible.
[1]: https://www.youtube.com/watch?v=eP31lluUDWU