Bao, breath is just part of the equation. What is relevant is the mental training and conditioning that permits someone to maintain focus under duress. That is what the warrior classes have trained for, for centuries.
My point about driving is that the human mind is capable of conditioning multiple layers of simultaneous activities, both mental and physical. That said, a person who is demonstrating a concept of internal structure and movement, should be able to do so while speaking. That was the original discussion. Fighting while maintaining that focus, is another level of the same developmental process, just with more layers of issues you must deal with, including breathing.
Bao wrote:
The problem is not completely about focus, but rather about breath.
Driving a car and talking is easy because change of breathing pattern doesn’t affect your ability to drive.
Punching when talking is hard because you don’t control your breath. ( it will be no good power)
If you balance and talk, your balance must adjust to the breath. It depends on how you talk. If you talk from the stomach it’s easy. If you tense the chest or neck, you can lose balance.