As a professional communicator, the more you know, the better able you will be to enter into another persons world model. And having superlative information gathering skills is one of the keys to being an effective communicator. When you are forced to guess, you are taking the chance of being inaccurate. But, when you KNOW, when you have the knowledge and experience to understand how another person is thinking, and why, you are opening up the opportunity for an astounding level of success when assisting this other person. Not only that, but when you are gathering information, the experiences you have had, will be the determining factor in your own ability to understand the information you are gathering.
Carmine believes in studying to mastery as many dominions of skill as possible.
It's not a matter of just learning what you need to learn only to do what you do well in a specific context. But more about learning all that you can. About as many things as you can. The brain has a near unlimited storage capability. And the more you use it, the better it works.