Diversity in novels helps social/emotional 'literacy' and addresses our inner narcissist. However advanced literacy is more than clarity about who we are as diverse individuals. Higher levels of literacy are the ability to understand documents with complex structure - e.g. legal and technical documents. Understanding the structure of  'higher level' literature (sequence, signs, symbolism, metaphors, etc) helps decipher the language of an insurance policy or contract and promotes advanced logic skills. In gr 10 we were considered able to understand the structure of Taming of the Shrew, by gr 12 MacBeth. To Kill A Mockingbird is a compelling story but also a well crafted document. The discussion of the structure, as a learning exercise, only happens when the group reads the same song sheet. Curriculum defines the foundation, the book report speaks to individual knowledge application/development. Whatever is used as the base should address more than social/emotional literacy.