Why shouldnt i draw in mechanical penicl?

My art teacher told us that we are to not use mechanical pencils in her class. She said she would explain why later but she never did. I love using mechanical pencils on my drawings, it helps me make finer lines and darken them better. Whats so bad about mechanical pencils that we are not allowed to use them in art... show more My art teacher told us that we are to not use mechanical pencils in her class. She said she would explain why later but she never did. I love using mechanical pencils on my drawings, it helps me make finer lines and darken them better. Whats so bad about mechanical pencils that we are not allowed to use them in art class?
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