Often, people use this to avoid burnout! However, not wanting more is a sign that the work is unpleasant in the first place. I can think of some situations where this is bad.
To an extent, you WILL have to accommodate their needs. Saying no may have them do the same to you.
Some actually get fired, as this signals little motivation.
Hates students who don't go beyond the minimum, while the syllabus doesn't expand. So in terms of exam optimization game theory it's actually a good idea to avoid interference from new topics. Great.
Probably when people were authority-less, like in school.