With school, I'm always torn b/w two opposing sides. One, I go to classes and everything to get my credits, and two, I go to classes and everything to learn. It sounds as though "your friend" falls into the former. For "your friend" to get good at guitar he needs to not answer the questions, he needs to be able to understand the answers. If he puts the right answers on the hw w/o knowing why then he's shooting himself in the foot.
If you learn how to play songs, then you learn songs. If you learn how to improvise, then you learn music.
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