Guitar is often taught as a "hobby" instrument, as opposed to a "serious" instrument, without any emphasis on musical literacy, in part because learning the basic mechanical aspect isn't that difficult. In one sense that's a good thing because it has produced an enormous number of people who can play to one degree or another.
If your goals for your son include being able to read and write music then it's your responsibility to have a talk with the instructor and explain what you want your son to get out of lessons. If this instructor won't (or can't) sign on to your preferred type of lesson plan, there are plenty of qualified teachers who can and will.
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