If your employer knows you are looking for other opportunities, they could stop giving you projects and start transitioning you before you are ready, or just fi

If your employer knows you are looking for other opportunities, they could stop giving you projects and start transitioning you before you are ready, or just fire you. That's a benefit to the employer, that probably is not a benefit to you, since you would likely want to quit on your own terms. Another quick example is knowing that your employees are researching how to unionize, and thus knowing to bring in anti-union resources. I'm sure there are more.