It's good job security when you become the only person who knows how to use a certain system or how to do a certain thing because everyone else left that knew how to do it that way
Unfortunately most of the older workers are getting close to retiring and if the younger workers aren't willing to at least learn the old way, we're going to have more issues like this. I used to be gung-ho about technology and digitizing everything but as I've gotten older I've seen the need to keep somethings the older way (or at least not completely reliant on computers).
The company I'm working for now is very gung ho about doing frequent knowledge transfers between people. They have been burned a few too many times by people leaving the company who are the only ones that understand a system. In the short run it seems like it wastes time and money, but it's a good insurance policy for the long term.
This is very situational. This occurs, and there are also many cases of workers vastly overestimating their contribution and that it would be impossible for some newer approach or any outsider to do what they do. When they retire, they are forgotten after a week.
They probably got rid of the people who still knew how to record everything without using a computer. I was talking with some municipal water guys this week and they said that when the computers go down, the newer workers don't know what to do.