I agree that it is communication. But how do you teach good communication skills? Besides just showing your work. I had a prof in engineering that was really good at explaining, giving examples. I still remember his teaching, these decades later because it was unusual. Not just the writing equations on the board and copying it down. What is the skill set that develops good communication? I had a friend, brilliant. Practically a perfect average graduating from Physics, then PhD in related. She was offered classified jobs. She questioned how I could go into business. Two years after research, she said, now I know why you went into business. And she went into project management and consulting. That requires serious discipline in writing skills. A kid never knows where they may end up in life and the skills necessary.