I've always remembered something Sanford Meisner my acting teacher told us. When you create a character it's like making a chair except instead of making someting out of wood you make it out of yourself. That's the actor's craft – using yourself to create a character.
In other words if a teacher only teaches in one way then they conclude that the kids who can't learn well that way don't have the ability when in fact it may be that the way the teacher's teaching is not a particularly good match to the way those kids learn.
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A friend of mine said no matter what I do I always look like an English teacher. She actually said you still look like a Campbell's Soup kid.