Most senior leaders do not need someone to teach them how to talk. They know their businesses, understand their expertise, and have communicated successfully for years.
But pressure changes the environment. A board presentation is not a normal meeting. A difficult question is not a rehearsed talking point. A camera changes the room. An important announcement carries consequences that an ordinary conversation does not.
Under pressure, capable people may rush, hedge, over-explain, tighten up, become overly scripted, lose connection, or briefly lose access to something they know perfectly well. That does not mean they suddenly became poor communicators. It means communication under pressure deserves to be practiced as its own skill.
The goal is not performance for performance's sake. The goal is access to your best thinking and communication when you need them most.