FWIW I told it No, for the same reason my Win10 laptop has been nagging me to update but I've not let it install for a month - until I've finished whatever work I'm doing I'm not going to let a possibly badly written patch stack the OS and leave me rebuilding the machine from scratch (yes - I'm looking at you Windows - TWICE) or dealing with whatever beta-level release macOS is going to throw out that breaks remote access etc. that I need on my build server.
It's like trying to leave a time share presentation.
Feature updates and quality updates are handled differently in Windows 10. You can delay feature updates for a year, quality updates (security) can only be delayed for a month.
I'm not sure what specific thing you're referring to when you say "nagware", seem my first paragraph, but there's no persistent nagging in Windows 10.
It's under Settings -> Updates & Security -> Advanced Options on Pro.
"This morning, as of 8:00 a.m., the update is available for download, and starting later today it will be automatically installed on all systems running the latest version (10.13.1) of macOS High Sierra."
That being said, there's no reason why this shouldn't be applied automatically.
You could argue that severity plays a role in the level opposition to such a feature however severity is an arbitrary assessment applied by the person issuing the update.
> the alternative scenario of N hundred million insouciant users lagging behind with a gaping security hole.
Last I checked macOS hadn't crossed the 50 million user mark. The combined iOS/macOS user base only just surpasses Windows.
"Install system data files and security updates" is turned on by default in the App Store Control panel, but the user can turn it off if they (unwisely) wish to.
In Windows XP, for example, Windows Update had a similar option, but that was removed in Windows 10.
(BTW the patch doesn't require restarting the machine, so it's not going to interrupt anyone's workflow)
Here's an article discussing their first use of this mechanism.
https://www.computerworld.com/article/2862976/apple-deploys-...
So uh... where are all those people who lost their mind about Windows 10 forcing updates?
http://i2.kym-cdn.com/photos/images/newsfeed/001/042/619/4ea...