> The second effect is related to the fact that companies usually target older people with expensive jobs. In an a big org these are the wizards who have the unwritten cookbooks in their brains. When they leave en masse, a lot of the organizational memory is gone, and expensive operational mistakes of the past are forgotten. These have longer effects that will haunt the company for many years.

This can be a good thing. In my experience these people are generally unambitious people who's claim to fame is that they held a job for a long period of time rather than any innate talent.

And when you have a majority of seniors who's only value is in being a well of knowledge, they're resistant to any change that reduces the value of that knowledge. This can quash innovation and perpetuates the anti-pattern of information hording.