I never said you stole the money. I never said you stole the money. I never said you stole the money. I never said you stole the money. The same is true in many conversations we have.
Verbal communications are frequently easier to understand when visuals are used.
It is much easier to explain and show someone something than to just explain it to them. Consider the operation of a piece of equipment. You can explain how to take it apart to clean it, but unless the person who is expected to do this can picture the procedure, the chances of success are minimal. For some people, written messages are a concern. Poor grammar, spelling, and composition skills can be stumbling blocks.