iOS starts shoving the update down your throat the moment it’s out. I wonder if there’s a “don’t try to auto update the OS dammit” setting somewhere. I guess I’ll be investigating this fall!

MacOS has the same annoying behaviour, but you can still close the notice and keep on keeping on.

But if you don’t use the newest macOS, you don’t get all security updates. ;(

You still get security updates for older versions, and you are fine without them anyway.