Many writers can't make a living. So to be able to teach how to write is valuable to them. But I don't really know about its value to the student. I don't mean it's useless. But I wouldn't have wanted anyone to teach me how to write.
When suffering knocks at your door and you say there is no seat for him, he tells you not to worry because he has brought his own stool.
The whole idea of a stereotype is to simplify. Instead of going through the problem of all this great diversity - that it's this or maybe that - you have just one large statement; it is this.
Once you allow yourself to identify with the people in a story, then you might begin to see yourself in that story even if on the surface it's far removed from your situation. This is what I try to tell my students: this is one great thing that literature can do - it can make us identify with situations and people far away.
Will C. Barnes