It has never failed here and once in 19 years is actually a big praise. BTW what's with those 15 minutes of preparing to update? There are funny UX issues with

It has never failed here and once in 19 years is actually a big praise. BTW what's with those 15 minutes of preparing to update? There are funny UX issues with Software Update. I press Restart now 3 times, nothing happens, after a while the system begins restarting and on the black screen I see a notification saying "We'll restart to update later tonight" or something. macOS is full of embarrassing stuff like this.