I had a friend who was in new product development for a large computer company. He liked to change jobs with in the company working in different division. He thought that if he made himself irreplaceable that it would make it difficult to change. He retired just before a merger not wanting to deal with the politics. I heard from a mutual friend that his wife has not retired her old shopping habits so he might try to pick up a little work here and there.
Yup, being “irreplaceable” will make a change difficult. But I’m looking to run out my career here.