Sort of a toxic article, possibly written by a person who thinks they know how people work. However, the writer ignores complexities of humans, and ends up being a rather poor judge of character. (See what I did there)
Anyway, snark aside, most people who are changing jobs do so after a long period of deliberation, and when they have made a choice, they will stop taking new responsibilities. Because taking new responsibilities when you know you're leaving would be unprofessional.
If someone is good at what they do, they will seem like dead weight on the day they leave. But if you look a year to the past, there should be a different view of accomplishments.
Of course, this is not the only explanation for this situation, but a common one.
Anyway, snark aside, most people who are changing jobs do so after a long period of deliberation, and when they have made a choice, they will stop taking new responsibilities. Because taking new responsibilities when you know you're leaving would be unprofessional.
If someone is good at what they do, they will seem like dead weight on the day they leave. But if you look a year to the past, there should be a different view of accomplishments.
Of course, this is not the only explanation for this situation, but a common one.