The world is not static and software these days is very interconnected. Dreams of not updating only work in a unchanging world. Sadly, this world is still to be found.
Funny you're saying that. In context of the stricken crowds I've read that FedEx, UPS and SouthWest had no problems at all, because many systems run on Windows95, or even something based on Win3.1x :-) Seems they are well isolated, but networked nonetheless. Or do you think they use bush-drums and smoke signs to conduct their businesses?
That probably has more to do with not jumping on the latest fad* and installing an unattended unrestricted automatically-globally-updating rootkit on all of your critical machines.
That is generally recognizable as stupidity. And the ones that did so are now paying the price.
* compliance tactics are very prone to fads. just look at cookie banners.
