Top performers don't need less coaching, they need strategic coaching.
Meaning, that top performers may need to perfect a skill with specific situations. Thus, requiring less of a general approach and more of a refined, laser-focused approach.
Top performers are hard to coach.
Actually, Top Performers should be easier to coach as they are typically more self-aware of their strengths and opportunities. Thus, they can typically self-assess well and are open to how to get additional gains. They want to stay a top performer!
Top performers already know everything.
They may know a great deal about what they are currently doing but can have blind spots. Some blind spots may be in how they are executing or communicating, or presenting, or something else. They also do not have insight into the application of the strengths of others.