Earlier quoted context omitted.
Twice I've been bit by the unexpected updates during shutdown during a power failure . At home my UPS is only good for 5 minutes, so I want to shut down as soon as the power goes down. I do that, and Windows starts on "Installing 17 updates", with absolutely no way for me to intervene. And powering down in the middle of OS updates has to be about the worst possible time for it.
It will simply roll back the half-finished updates and retry the next shutdown. Those things are done transactional. Powering down won't hurt it.
And good luck fixing that, especially if your hard-drive is encrypted.