ChromeOS updates the system once every 6 weeks and still has a far more secure system.
shutdown /r /t 0
AFAIK, this has always avoided updates.
^_^
This can be rather dangerous if your laptop is stuck in a backpack with no airflow on a hot day.
The laptop would be hot enough to toast bread when I pull it out.
If I'm out of town for 2 weeks, I cannot have my Windows 10 machine reboot, it runs the software for my security cameras and that can't start until I log back in. Thankfully, I set up Windows Update to not install updates automatically(Win10 Pro) way back when it came out and it has continued to stick. Major updates are a constant worry that they will finally break this forever when it shouldn't even be a concern in the first place.
Is it not still like that? MacOS seems worse to me, since restarting when an update exists isn't sufficient: you have to remember to go back to the update and click 'update & restart'...
Linux handles this best though, by a long shot.
IME OSX is way better, the shutdown update process is much shorter than on Windows (where it is frustratingly long) and not all updates require rebooting.