Surprise! People actually stay at jobs a little longer now than they did 30 years ago. But 4.6 years is still not a career; people used to switch careers a lot less than they do today.
The switches are often necessary because of the changing nature of work, and the jobs left for people to do.
That results in what Farai Chideya calls , which is the title of her book. She visited in 2016, and we carry the interview again here.